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I have a 3 TB Seagate external drive that I removed and placed in my newly built tower. The 2 TB external I did with this works fine, but the 3 TB drive won't recognize, won't mount, and GParted shows

this (sorry it's a link - not enough reputation)

After running fdisk -l I read in this thread that it's because it starts on sector 63, but GParted doesn't give me the option to resize this disk.

I'd rather not lose the data on the disk, so I wanted to ask for help before I accidentally deleted everything. Any suggestions?

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  • Some of the 3TB drives used proprietary or odd work arounds to make drive compatible with XP. XP would not work with correctly partitioned with gpt drives. Fdisk should not even work on a gpt partitioned 3TB drive. It should just show one large gpt partition. But parted or gdisk should then show correct partitions. What does sudo parted -l show?
    – oldfred
    Nov 1, 2014 at 22:48
  • Model: ATA ST3000DM001-9YN1 (scsi) Disk /dev/sdb: 3001GB Sector size (logical/physical): 512B/4096B Partition Table: msdos Number Start End Size Type File system Flags 1 32.3kB 375GB 375GB primary boot Nov 1, 2014 at 22:51
  • I have a fresh 4 TB drive installed. Is there a way to copy the data over for recovery and then just wipe the 3 TB drive? Nov 2, 2014 at 2:26
  • You are showing MBR(msdos) partitions. So best to convert to gpt. You can copy data and should as backup anyway. But depending on partitions may be able to use gdisk to convert to gpt. rodsbooks.com/gdisk/mbr2gpt.html But just because we now can have multi-TB drives I do not suggest one large partition unless storing video or a few other uses. I also suggest having an efi partition at beginning of drive in case you want to install Ubuntu in UEFI boot mode. And with the very large drives I suggest an Ubuntu install even if just as an emergency repair boot or backup boot method.
    – oldfred
    Nov 2, 2014 at 16:01

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