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What is the maximum number of partitions that can be made on a hard drive?

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Can anyone tell how many partitions we can create on a hard disk? While alphabet no are 26 then how we will assign drive letter for more than 24 partition.

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  • Thanks for editing your older question, but there's really no point to reopen it if it's already answered in a duplicate. It'd make a difference if your question had no answers or there wasn't a duplicate already.
    – slhck
    Oct 4, 2012 at 12:45

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That depends on how you format the disk.

  • Amiga rigid disk block: Linked list of partitions. Thus you can keep adding until the disk is full with partition entries (and no data). For practical use: unlimited partitions.
  • Ancient MBR: 4 (4 primary partitions)
  • MBR with extended partitions: 3 primary, one extended which is a linked list (and thus infinite?).
  • GPT: 128
  • BSD Disklabel: 15 or more.
  • Apple partition map: ...

Etc etc etc.

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You can create 4 primary partitions, but any number of extended partition.

See the difference at: http://en.wikipedia.org/wiki/Disk_partitioning#Primary_partition

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If you're using Windows and GPT partitioning you can have maximum 128 partitions on hardisk, although GPT itself doesn't limit the number of partitions (http://msdn.microsoft.com/en-us/windows/hardware/gg463525.aspx).

If you are using MBR you can have 4 primary partitions or 3 primary and one extended partition which can then have multiple logical drives, as far as I can tell by searching online there is no definite limit to the number of logical partitions. In this thread you can see a guy did the test and gave up at 347 logical partitions

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