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Though, I consider 2 TiB to be the practical limit for MBR, since so many
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Possibly Windows Vista, if it works like Windows 7) from it.
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The only case where using MBR on a 2–4 TiBĭisk would produce a benefit would be if you wanted to boot Windows 7 (or Support, there seems to be limited benefit to carefully crafting aĬonfiguration to enable use of MBR on a 2–4 TiB drive-at least,įor the OSes I tested.
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The problem might have been at the driver level, though, in which case you might have better luck on real hardware.īecause Linux, FreeBSD, and Windows 7 all have relatively mature GPT One caveat: It'sĬonceivable that these OSes were interacting with a peculiarity of the QEMUĮnvironment to create these problems however, as Linux and FreeBSD wereĪble to handle the disks, I suspect the real problem was in the OSes It just ignored everything past the 2 TiB mark. Reported the already-created partition was smaller than it was apparently Linux or to create a new filesystem on the partition. Its disk setup tool, but was unable to mount the partition I created in BeOS reported the disk information correctly in Windows XP saw the disk asīeing just 8 GiB in size. Reported that it was unable to access the disk. Windows Me didn't show a drive icon, and its FDISK Handling a partition that spanned the 2 TiB mark were Linux, FreeBSD, and To make a long story short, the only OSes that seemed capable of Later ran a followup test with Windows 7 under VirtualBox. OSes, including Linux, FreeBSD, Windows Me, Windows XP, OS/2, and BeOS. I tested with a number of legacy and modern I was able to create a 4 TiB virtualĭisk that was just kilobytes in size on my real disk (although it grew as I QEMU machine emulator and its virtual disks, which can appear much larger To test the practicality of such a configuration, I ran tests using the Would be somewhat limiting, but it fits within the MBR framework. Which could in turn hold many logical partitions. In a single primary partition, or perhaps in a single extended partition, Use MBR on a 4 TiB disk, so long as all the space after the 2 TiB mark is Both of these are 32-bit values, so in theory you could MBR records partition locations in terms of the starting sector and the (Note that you can use GPT on disks with 4096-byte sectors, so such disks don't require the use of MBR they just enable it for disks that are between 2 TiB and 16 TiB in size.) Four for the Price of Two? Option (and indeed, may be unavoidable) for some disks. Unfortunately, as described on this page, neither solution isĬurrently a good one for all cases, although using larger hard disk sectors is an These are the possibility ofĮxtending the 2 TiB limit to 4 TiB by literal interpretation of the MBRĭata structure limits and using 4096-byte sectors rather than the more common 512-byte Isn't as imminent a threat as I suggest on my What's a GPT? page.
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Note: This page is part of the documentation for my GPT fdisk program.Ī couple of loopholes exist that may make you think that the 2 TiB limit If you find this Web page useful, please consider making a small donation to help keep this site up and running.
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This Web page is provided free of charge and with no annoying outside ads however, I did take time to prepare it, and Web hosting does cost money. Working Around MBR's Limitations Working Around MBR's Limitations by Rod Smith, Web page update:, referencing GPT fdisk version 1.0.4