How to delete EISA partition

Assuming you are using Windows XP or Vista, you can use the DISKPART utility to delete these OEM partitions from DELL and other hard drives.

If you have data anywhere on the drive that you will be deleting the EISA partition from, backup that data now.

  1. Connect the drive to the computer. If it is an IDE drive then do this with a USB-to-IDE device, or connect the drive directly to the IDE cable. If ti is a SATA drive then do this with a USB-to-SATA device, or connect the drive direclty to the SATA controller on the motherboard. In essence, the drive must be connected to the PC and it must be “seen” by the operating system.
  2. XP: Start a command prompt in XP by going START > RUN > type CMD <ENTER>
    Vista: Start a command prompt in Vista by going START > type CMD <ENTER> in the “Start Search” box.
  3. In the command prompt type DISKPART <ENTER>. This starts up the DISKPART utility.
  4. Type LIST DISK <ENTER>. This shows the all the disks connected to the computer. Decide which one is the one you are wanting to delete the EISA / OEM partition from, and make note of which number it is.
  5. Type SELECT DISK n <ENTER> (where n = the number of the disk you noted in step 4)
  6. Type LIST PART <ENTER>. This shows the all the partitions contained in the drive you are working with. Decide which one is the one you are wanting to delete, and make note of which number it is.
  7. Type SELECT PART n <ENTER> (where n = the number of the partition you noted in step 6)
  8. Type DELETE PART OVERRIDE <ENTER>. This deletes the partition you selected.
  9. You are done with deleting the partition. If you want to, you may now EXTEND another adjacent partition into that free space you just created.


Posted under Hardware, Microsoft

This post was written by Content Curator on December 10, 2008

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12 Comments so far

  1. Helmuth March 4, 2009 9:23 pm

    It works for me, thank you very much man_

  2. ImGeo March 26, 2009 2:30 am

    PERFECT!! Love it. I’ve been all over google, and on many forums… no one had a simple solution like this. They all suggested a 2000/XP disk, random partition software, boot disks, etc etc… but this is so simple, and it works!

  3. avinash October 21, 2009 3:26 am


  4. arif November 22, 2009 11:54 am

    thanking you so much. worked like a charm. didnn need to buy a software to merge/delete partition. thanks again

  5. MONKEYBOY666 December 1, 2009 5:25 am

    Thxs dude saved me a hellava lot of time. super easy and sorted in secs!



  6. Ron January 10, 2010 5:05 pm

    This procedure worked great….but….after deleting the partion when I rebooted my PC, it made my prior “Primary Partition” into an EISA partition and I could no longer modify any properties of the partition that held all my software, data and operating system. It showed it without any drive letter and it would not bring up any commands when I right clicked on it. Luckly in windows explorer it still showed up as my C: drive and my operating system still worked, but, I can modify even less now. (FYI, runing Vista Home Premium, but, want to upgrade to Windows 7).

  7. Thomas January 19, 2010 4:12 am

    THX dude.. But now i’ve got a problem.. it leaves me vith a partition on my disk with 10 gb that i can’t delete.. what do i have to do to delete this partition???

  8. Unitrobe March 1, 2010 11:53 am

    Thanks! Very simple, clear and helpful how-to.

  9. Amila March 6, 2010 12:40 am


  10. Aamberg March 9, 2010 11:16 am

    Awesome, so simple, thank you for this explanation. Cheers.

  11. kb-admin March 9, 2010 12:02 pm

    @Thomas: Hmm… what was the number and name of that partition, shown in the DISKPART volume listing?

  12. Bwana March 15, 2010 12:31 pm

    Thanks for the steps. What do i do with the free space am unable to merge it to C.


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