More details are available on the GPT Wikipedia page. To work around all these limitations, recent disks use 4096-byte sectors and the GPT partition table ( GPT stands for GUID – Globally Unique IDentifier – Partition Table).
More annoying, on disks with capacity greater than 2TB, space above this limit is not available. If you want more than that, you need to create an extended partition (using one of the 4 primary slots), and then create logical partitions inside. This organization allows for 4 primary partitions only. Not recent disks use 512-byte sectors and the MBR partition table ( MBR stands for Master Boot Record).
Partitions get their names from the disk name itself and add a number starting at 1 ( /dev/sda1, /dev/sda2, etc or /dev/vda1, /dev/vda2, etc).Ī partition table is a special structure containing partitions organization. PresentationĪ disk can be used as a simple entity or broken up into one or more partitions.ĭisks are generally called /dev/sda, /dev/sdb, etc, in physical servers ( s for scsi even though they’ve got IDE, SATA or SAS interfaces) and /dev/vda, /dev/vdb, etc, in virtual machines.
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