If you have several physical hard disks on your computer, you can mark a partition as active on each disk, but only the active partition on the first hard disk detected by your BIOS will start up the computer. Doing otherwise will cause all kinds of problems. You can only have one active partition per physical hard disk. Windows restricts these limits further to 256 TB for a single partition (NTFS limit), and 128 partitions.Īlso, there are a few things to note about marking a partition as active:Ī logical drive or extended partition cannot be marked as active, only primary partitions can be changed to active. It can also support theoretically unlimited partitions. (For 512-byte blocks, this is 9.44 ZB – zettabytes. The GPT disk itself can support a volume up to 2^64 blocks in length. GPT = GUID Partition Table disks are new, and are readable only by Windows Server 2003 SP1, Windows Vista (all versions), and Windows XP 圆4 Edition. It supports 4 primary partitions per hard drive, and a maximum partition size of 2TB. MBR = Master Boot Record is the standard partitioning scheme that’s been used on hard disks since the PC first came out.
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