[91]*91Affirmed, by published opinion. Judge NIEMEYER wrote the opinion, .in which Judge WILKINSON joined. Judge TRAXLER wrote a dissenting opinion.
OPINION
NIEMEYER, Circuit Judge:
After America Online, Incorporated (“AOL”) released to the public its Version 5.0 access software, consumers filed numerous class actions against AOL, alleging that the software had substantial “bugs” in it and was incompatible with their computers’ other applications software and operating systems, causing the computers to be damaged. AOL tendered the defense of these actions to its insurers, St. Paul Mercury Insurance Company (“StJPaul”), its primary insurer, and to Underwriters at Lloyd’s of London, its professional liability insurer. St. Paul denied coverage mainly because the damages claimed by the consumers were not “property damage” as defined by the relevant provisions of the applicable policy. AOL commenced this action against St. Paul for a declaratory judgment that St. Paul owed AOL a duty to defend and indemnify and for damages.
The district court granted summary judgment to St. Paul on the grounds that the consumers’ underlying complaints did not allege physical damage to tangible property and that any damage from loss of use of tangible property fell within a policy exclusion. We affirm.
I
AOL, a Delaware corporation with its principal place of business in Dulles, Virginia, is an Internet service provider whose proprietary software products enable consumers to access the Internet and AOL’s online services, such as e-mail.
In October 1999, AOL released to the public its Version 5.0 access software, and within a few months, consumers began filing class-action lawsuits against AOL in state and federal courts throughout the country, alleging damage from the installation and operation of Version 5.0. These plaintiffs alleged that Version 5.0 was rushed to market after minimal testing to mark AOL’s tenth anniversary and, as a result, was not yet free of “substantial bugs and incompatibility with numerous applications and operating systems.” They asserted that the software’s installation process was “defectively designed and/or unreasonably dangerous,” causing “serious injury to their computer system and preexisting software.” Specifically, the plaintiffs alleged:
(1) interference to users’ host systems’ communications configurations and settings such as non-AOL communications software and online services the plaintiffs are using or might want to use in the future;
(2) the inability of users to connect to other [Internet service providers], competitors of AOL;
(3) the inability to run non-AOL e-mail programs, or connect to local networks;
(4) the addition or alteration of hundreds of files on the users’ system, including many essential components of the Windows operating system, which may cause the system to become unstable; and
(5) the inability of users to remove the AOL 5.0 software completely, so as to restore their computer’s communications configuration, so that other competitor online services could be used.
For many of the plaintiffs, “the only reported remedy [was] to reinstall Windows, which may [have] involvefd] the more extreme step of first reformatting the hard drive on their personal computer.” In short, the underlying complaints alleged that Version 5.0 altered the plaintiffs’ ex[92]*92isting software, disrupted their network connections, caused the loss of stored data, and caused their operating systems to crash.
Forty-three of the lawsuits were consolidated by the judicial panel on multidistrict litigation (“MDL”) for pre-trial proceedings in the Southern District of Florida, pursuant to 28 U.S.C. § 1407, and the plaintiffs in those cases filed a consolidated MDL complaint. Certain of the claims, dubbed the “Bermuda Triangle” claims because of their “catch-all” allegations that could not be recreated or explained in laboratory testing, were handled separately from the MDL complaint. The parties to the multidistrict litigation later settled their disputes, and under a court-approved agreement, AOL established a cash fund of $15.5 million to compensate the plaintiffs.
As the individual class-action suits were filed against AOL, AOL tendered the defense to its insurers, St. Paul and Underwriters at Lloyd’s of London. St. Paul denied coverage, explaining:
The claimants do not seek damages for bodily injury or property damage or for any injury or damage that was caused by an event as those terms are defined by the St. Paul [commercial general liability] coverage. The policy language excludes any loss or damage arising out of or caused by intentional or expected acts.
Later, St. Paul particularized this position to state that the plaintiffs’ claims “do not allege damage to ‘tangible’ property and are not property damage as defined by the St. Paul [commercial general liability] policy.” Later yet, St. Paul also pointed to its “impaired property” exclusion which denies coverage for loss of use of tangible property that was not physically damaged. In response to the denial of coverage, AOL commenced this action against St. Paul, alleging breach of contract and seeking declaratory judgment that St. Paul was obligated to defend and indemnify AOL. It also demanded defense costs and compensatory damages.
On cross-motions for summary judgment, the district court denied AOL’s motions and granted St. Paul’s motion, making a distinction between computer software and computer hardware and concluding that the underlying suits alleged damage to computer data and systems but did not allege “physical damage to tangible property.” Although the court recognized that property damage under the policy also included “loss of use of tangible property” and that the plaintiffs alleged loss of use of their computers, it concluded that coverage for loss of use was excluded by the impaired property exclusion.
From the district court’s judgment, AOL filed this appeal, contending (1) that the damages claimed in the underlying complaints amounted to “physical damage to tangible property,” and (2) that the complaints alleged “loss of use of tangible property” that was not excluded from coverage by the impaired property exclusion. St. Paul filed a cross-appeal, challenging the district court’s conclusion that the underlying complaints alleged “loss of use” of tangible property.
II
Because this diversity action was filed in the Eastern District of Virginia, we apply Virginia choice-of-law rules to determine which state’s substantive rules apply. See Klaxon Co. v. Stentor Elec. Mfg. Co., 313 U.S. 487, 496-97, 61 S.Ct. 1020, 85 L.Ed. 1477 (1941) (holding that a federal court with diversity jurisdiction must apply the choice-of-law rules of the State in which the federal court sits). In this case, the insurance contract between AOL and St. Paul was formed in Virginia and therefore [93]*93we apply Virginia substantive law. See Buchanan v. Doe, 246 Va. 67, 431 S.E.2d 289, 291 (1993).
Under Virginia law, an insurer’s obligation to defend an action “depends on comparison of the policy language with the underlying complaint to determine whether any claims alleged [in the complaint] are covered by the policy.” Superformance Int’l, Inc. v. Hartford Cas. Ins. Co., 332 F.3d 215, 220 (4th Cir.2003) (internal quotation marks and citation omitted). And the obligation to defend is broader than the obligation to indemnify. “The obligation to defend arises whenever the complaint against the insured alleges facts and circumstances, some of which, if proved, would fall within the risk covered by the policy.” Brenner v. Lawyers Title Ins. Corp., 240 Va. 185, 397 S.E.2d 100, 102 (1990) (internal citations omitted); see also Solers, Inc. v. Hartford Cas. Ins. Co., 146 F.Supp.2d 785, 791 (E.D.Va.2001). Adhering to the canon of construction that ambiguous terms in insurance agreements are construed against the insurer, Virginia law elaborates:
If the language of an insurance policy is unambiguous, we will give the words their ordinary meaning and enforce the policy as written. On the other hand, because the principal purpose of insurance is protection and insurance policies are drafted by insurance companies, if the language of a policy is capable of different interpretations, we will construe it in favor of coverage or indemnity and against a limitation of coverage.
United Servs. Auto. Ass’n v. Webb, 235 Va. 655, 369 S.E.2d 196, 198 (1988).
The underlying complaints allege in general that AOL’s Version 5.0 access software altered the customers’ existing software, disrupted their network connections, caused them loss of stored data, and caused their operating systems to crash. AOL contends that these claims are for physical damage to tangible property as covered by St. Paul’s policy, making essentially three arguments in support of this contention. First, it argues that because the plaintiffs have alleged damage to “computers,” they have alleged “physical damage to tangible property.” Second, it argues that because software involves the arrangement of atoms on computer disks, software has a physical property and, on that basis, the complaints’ allegations of damage to software allege “physical damage to tangible property.” Third, it argues that, at best for St. Paul, the scope of the policy term “tangible” in defining property damage is ambiguous and, as such, must be construed in favor of AOL.
St. Paul contends that the underlying complaints allege two types of harms: (1) “interference with or reconfiguration of non-AOL software, including communication configurations, networking mechanisms and operating systems” and (2) “the loss of ‘data’ and ‘information.’ ” St. Paul argues that these injuries are not covered by the policy because computer software and data are not “tangible property.” It asserts that computer software and data are “nothing more' than information and ideas that happen to be stored in electronic form.” Moreover, it maintains that “[t]here are no allegations in the MDL Complaint that hardware—tangible property—-was physically damaged.” Finally, St. Paul' contends that nothing in the complaints amounts to allegations of loss of use of computer hardware. On the basis of this contention, it has pressed its cross-appeal.
The parties do not dispute the controlling language of the applicable policy. That language provides that St. Paul will “pay amounts [AOL] is legally required to pay as damages for covered ... property [94]*94damage.” Property damage in turn is defined as
• physical damage to tangible property of others, including all resulting loss of use of that property; or
• loss of use of tangible property of others that isn’t physically damaged.
The “impaired property” exclusion in the policy provides that St. Paul is not obligated to cover
property damage to impaired property, or to property which isn’t physically damaged, that results from:
• your faulty or dangerous products or completed work; or
• a delay or failure in fulfilling the terms of a contract or agreement.
And the policy defines impaired property as:
tangible property, other than your products or completed work, that can be restored to use by nothing more than:
• an adjustment, repair, replacement, or removal of your products or completed work which forms a part of it; or
• your fulfilling the terms of a contract or agreement.
AOL’s first argument, that by alleging damage to computers, the consumers have alleged they sustained property damage, fails for its lack of specificity. Because a “computer” consists of hardware (con-cededly tangible property), an operating system, and applications,software; as well as peripheral devices with their own hardware and software, a general allegation that a computer was damaged may refer either to damaged hardware or damaged software. See Alan Freedman, The Computer Glossary: The Complete Illustrated Dictionary 173, 364 (9th ed. 2001) (“In operation, a computer is both hardware and software.... The hardware design specifies the commands it can follow, and the instructions tell it what to do”). But because the underlying complaints ultimately claim damage to the consumers’ software, we are brought to AOL’s central argument — that damage to software is physical damage to tangible property.
Although AOL acknowledges that software is distinct from hardware and that software provides instructions to the hardware to perform, it argues that the particular physical properties of the hard drive of a computer that contains instructions and data indicate that software can be tangible property:
As stored on a hard drive, data consists of the arrangement “of hundreds of thousands of atoms” of “cobalt, iron, and other magnetic materials” in a perceivable and unique pattern. The data consists of small electromagnets in certain alignments. Once data is stored in a cell of a hard drive, that cell is physically different from a cell without data, and the physical differences between the two cells can be detected through the use of certain tools. Data stored on a hard drive is visible with the use of a microscope.
Because these atoms in the form of cobalt, iron, and other magnetic material are physical, AOL argues, the data and instructions retained on them are tangible property.
Taking “tangible” to have its usual and ordinary meaning, see American Health Ins. Corp. v. Newcomb, 197 Va. 836, 91 S.E.2d 447, 451 (1956) (instructing that contract terms “ ‘be given their usual, ordinary and popular meaning’ ”) (citation omitted), we understand the term to mean “capable of being touched: able to be perceived as materially existent esp. by the sense of touch: palpable, tactile,” see Webster’s Third New Int’l Dictionary of the English Language Unabridged 2337 [95]*95(1993). And, specifically, “tangible property” means “having physical substance apparent to the senses.” Id. These common definitions essentially equate the terms “tangible” and “physical” and defeat any sense of ambiguity that AOL attributes to the term “tangible.” Thus, employing these ordinary meanings, we conclude that the physical magnetic material on the hard drive that retains data, information, and instructions is tangible property.
But the conclusion that physical magnetic material on the hard drive is tangible property is quite separate from the question of whether the data, information, and instructions, which are codified in a binary language for storage on the hard drive, are tangible property. Certainly the hard drive itself is a medium in which the data, information, and instructions are stored, but the data itself must be considered apart from the medium. Thus, if a hard drive were physically scarred or scratched so that it could no longer properly record data, information, or instructions, then the damage would be physical, affecting the medium for storage of the data. But if the arrangement of the data and information stored on the hard drive were to become disordered or the instructions were to come into conflict with each another, the physical capabilities and properties of the hard drive would not be affected. Such disordering or conflicting instructions would amount to damage to the data and information and to the instructions (i.e., the software) but not to the hard drive. The magnetic material on the hard drive could be reoriented and reordered with reinstallation of the instructions. So it is that we make the distinction between hardware and software.
All data, information, and instructions used in a computer are codified into a binary language, and the binary language is processed by the computer by the operation of switches that are “on” or “off.” The unique combination within a group of switches that are on and off forms bytes of codified information representing letters, numbers, and other commands, upon which further operations and processes are built. The switches are configured on or off by electricity. Thus, when the letter “p” is pressed on the keyboard, the electrical pulses transmitted through the switches invoke a code that opens and closes switches in a particular configuration that transmits a “p” to the screen. Once data are created in the processing systems of a computer, they may be stored magnetically on hard drives or disks that record the on-and-off configurations.
Thus, software begins with a set of instructions written by programmers and translated into binary code which is then transmitted to the computer through the electronic charges turning on some but not all switches and creating a configuration of on and off switches. As a result of these configurations, the computer performs the specified tasks of the programmer, and the established configurations are retained magnetically.
With this description, albeit simplified, the distinction between data or instructions and the physical machines that give them meaning becomes apparent. Instructions to the computer and the data and information processed by it are abstract ideas in the minds of the programmer and the user. The switches and the magnetic disks are media, as would be paper and pencil. Loss of software or damage to software thus is not damage to the hardware, but to the idea, its logic, and its consistency with other ideas and logic. Of course, without any code and instructions, the hardware consists simply of millions of electronic switches, circuits, and drives that can be turned on or off but that cannot function as a computer. To a user, [96]*96such a computer would be “dead.” But regardless of whether the software is rendered unusable, the hardware remains available for instructions and recording.
By analogy, when the combination to a combination lock is forgotten or changed, the lock becomes useless, but the lock is not physically damaged. With the retrieval or resetting of the combination— the idea — the lock can be used again. This loss or alteration of the combination may be a useful metaphor for damage to software and data in a computer. With damage to software, whether it be by reconfiguration or loss of instructions, the computer may become inoperable. But the hardware is not damaged. The switches continue to function to receive instructions and the data and information developed on the computer can still be preserved on the hard drive. While the loss of the idea represented by the configuration of the computer switches or the combination for the lock might amount to damage, such damage is damage to intangible property. It is not damage to the physical components of the computer or the lock, i.e., to those components that have “physical substance apparent to the senses.” See Webster’s Third New Int’l Dictionary, supra, at 2337 (defining “tangible property”).
The insurance policy in this case covers liability for “physical damage to tangible property,” not damage to data and software, i.e., the abstract ideas, logic, instructions, and information. Thus, while it covers any damage that may have been caused to circuits, switches, drives, and any other physical components of the computer, it does not cover the loss of instructions to configure the switches or the loss of data stored magnetically. These instructions, data, and information are abstract and intangible, and damage to them is not physical damage to tangible property. See Lucker Mfg. v. Home Ins. Co., 23 F.3d 808, 819 (3d Cir.1994) (holding that where the real value of an anchoring system design “is in the idea, not in the physical plans that memorialize it, any loss in value of the design represents a loss in the value of the idea, which is not a loss of use of tangible property”); State Auto Prop. & Cas. Ins. Co. v. Midwest Computers & More, 147 F.Supp.2d 1113, 1116 (W.D.Okla.2001) (holding in an insurance context that “[ajlone, computer data cannot be touched, held, or sensed by the human mind; it has no physical substance. It is not tangible property”).
The claims in the underlying actions assert that AOL’s Version 5.0 software damaged consumers’ software, including their preexisting operating system software. They allege that Version 5.0 “ruthlessly modifie[d] or overwr[ote] critical Windows communications files and change[d] many of the default communications settings.” They assert that the installation of Version 5.0 cut off non-AOL Internet access and caused computer system instability. Indeed, with a large amount of reconfiguration, the computer could lack any instruction (operating system) and could just “die.” But all of these damages are related to the instructions configuring the switches and the data preserved on the hard drive. The physical aspects of the switches and the hard drives were not damaged — they were reconfigured. With yet more recoding, the reconfigurations could be reversed and the initial operating systems and application software reinstalled. Obviously such a process could become costly. As relevant to this suit, however, such software damage and the cost to restore it would not be covered by the policy of insurance issued to AOL by St. Paul. St. Paul covered AOL’s liability for physical damage to tangible property of others.
[97]*97Going beyond the allegations contained in the underlying complaints, which under Virginia law are determinative of whether St. Paul is obligated to provide a defense, AOL refers to testimony of consumers in the underlying actions to demonstrate that the damages claimed were for physical damage to tangible property. But even if we review these excerpts, they do not demonstrate that AOL’s Version 5.0 caused physical damage to the hardware.
Thus, for example, plaintiff Eric Lloyd answered, in a deposition, that he decided to sue AOL “[ajround the time my computer went haywire, meaning it died entirely.” In response to the question whether he was “talking about when [he] couldn’t get from DOS into Windows,” the plaintiff answered, “Correct.” Plaintiff Merk French, who testified that his “keyboard was like the top of this table, it had no effect,” elaborated that, after installation of Version 5.0, his computer would not shut down and when he performed a hard boot, the computer was often unresponsive, i.e., the operating system would refuse to recognize commands given through the keyboard. In a similar vein, plaintiff Mark Harken testified that after he installed Version 5.0, his computer froze virtually every time that he logged onto AOL, and he described “freezing” as “you couldn’t operate the system.” Plaintiff Robert Kerr, Jr., testified that when he was unable to access programs after installing Version 5.0, he could sometimes cure the problem by shutting down the computer and starting it again. And while plaintiff Eddie Jean Harp asserted in her class-action complaint (consolidated in the multi-district litigation) that her use of Version 5.0 “caused physical injury to her computer and software,” her allegations focusing on Version 5.0’s effects on “computer systems of the plaintiffs” clarify that the injury was to files, settings, and operating systems — all software.
Even though a few other testimonial complaints are vague enough to suppose initially that the plaintiffs complain of damage to physical property, a closer look at the complaints reveals that the plaintiffs actually complain of damage to software. For example, plaintiff Laurie Bejoian testified that after experiencing problems with Version 5.0, she took her computer to a service center, where she requested a new hard drive. Plaintiff Russell Hightower testified that, sometime after he installed Version 5.0, his computer “developed a malfunction on the motherboard” and that when he took it in for repairs, he was told “it was damaged and not reparable.” Plaintiff Eric Lloyd testified that his computer “died entirely.” And Alice Patricia Carriek testified that after she installed Version 5.0, her computer began making clicking noises when she entered a command through the computer’s touch pad. At best for AOL, these excerpts contemplate computer damage broadly, suggesting damage to both hardware and software. But the fact that a service center replaced a hard drive or a motherboard is no more indicative of a hardware problem than a software problem, even though replacement of the hardware might have been less expensive than attempting to reconfigure or adapt the software. And this vague deposition testimony of a few plaintiffs complaining of the general failure of their computers must be viewed alongside the hundreds of claims of the other plaintiffs, whose allegations reflect a common complaint about damage to software resulting from the installation of Version 5.0. As the consumers have generally alleged, AOL’s Version 5.0 had “substantial bugs and incompatibility with numerous applications and operating systems,” and that the software’s installation process was “defectively designed and/or unreasonably dangerous.” These are all software prob[98]*98lems that do not amount to physical damage to tangible property.
III
AOL contends that even in the absence of physical damage to tangible property, it was exposed to property damage claims because “property damage” is defined by the policy to include loss of use of tangible property of others. It notes that the consumers’ underlying complaints allege loss of use of their computers' and computer peripherals because of the installation of AOL Version 5.0. The district court agreed with AOL’s characterization of the underlying claims that loss of use was alleged in the complaint, but it denied any coverage because such damage was excluded by the “impaired property” exclusion contained in St. Paul’s policy. AOL argues that the district court erred in construing the impaired property exclusion to bar coverage for loss of use.
The relevant portions of the impaired property exclusion read as follows:
We won’t cover property damage to impaired property, or to property which isn’t physically damaged, that results from:
• your faulty or dangerous products or completed work;
Impaired property means tangible property, other than your products or completed work, that can be restored to use by nothing more than:
• an adjustment, repair, replacement, or removal of your products or completed work which forms a part of it....
AOL argues that this exclusion cannot be applied because the underlying consumer complaints “allege physical damage to and loss of use of computers that could not be fixed simply by repairing, removing, or replacing AOL Version 5.0, thus taking the claims outside the definition of impaired property.”
This argument, however j fails to address the relevant portion of the exclusion, which reads in edited form:
We won’t cover property damage [including loss of use of tangible property] ... to , property which isn’t physically damaged, that results from ... your faulty ... products.
The straightforward meaning of this exclusion bars coverage for loss of use of tangible property of others that is not physically damaged by the insured’s defective product. This exclusion places a limitation on the coverage of consequential damages, restricting coverage to loss of use of other persons’ properties that are physically damaged. Without the limitation, St. Paul’s risk would have been much greater and the premiums for such a policy undoubtedly would have been more expensive. St. Paul would have been asked to defend claims, for example, that because the computer was rendered defective because of the faulty Version 5.0, the store could not operate its computers, and because the store could not operate its computers, it had to close, causing loss of use of the premises and the business. The limitation imposed by the impaired property exclusion is designed specifically to deny coverage for this broader risk. See Seagate Tech., Inc. v. St. Paul Fire & Marine Ins. Co., 73 F.3d 370 (Table), 1995 WL 759217, at *1 (9th Cir. Dec. 22, 1995) (finding no duty to defend based on impaired property exclusion where loss of use of inventory that was not physically damaged was caused by insured’s faulty product or failure to fulfill terms of contract).
As has been demonstrated in Part II, ante, the faulty Version 5.0 software [99]*99caused damage to other software, including operating systems. But there has been no demonstration or claim that the ;physical or tangible components of any computer were damaged. In the absence of property that is physically damaged, AOL’s arguments for covering loss of use must be rejected.
Because we conclude that the impaired property exclusion applies, we need not address St. Paul’s issue on cross-appeal— whether the underlying complaints allege loss of use.
TV
For the reasons given, the judgment of the district court is affirmed.
AFFIRMED