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Deleting an EFI System Partition with Windows 7

If you connect a hard drive that has been used in another computer before, you might find an undeletable EFI partition on it. In Disk Management this looks as follows:
disk_management_efi

 

 

 

 

 

 

However, the diskpart command-line utility can be used to delete this partition. By the use of the clean command all partition information will be discarded on the selected disk.

WARNING: this will not only delete the EFI partition but all partitions and everything on the disk.

After that you’ll be able to partition the disk in the Disk Management GUI. Or you can do this with diskpart, too:

diskpart

 

 

 

 

 

 

 

 

 

See the Technet Documentation for more infomation on diskpart.

 

2 Comments.[ Leave a comment ]

  1. You can use long path tool as well.

  2. Are you sure? I haven’t tested it but the description doesn’t say anything about partitioning capabilities.

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