I have a WD My Passport 4.0 TB USB with GPT partition, that was used in a 2013 MacBook Pro.
My Linux Mint 17 is "Unable to mount location Can't mount file". Linux Mint "Disks" shows the 4 TB drive as having GUID Partition Table, partition type Apple HFS/HFS+ and contents unknown. GParted shows it as having 3.64 TiB partition with unknown file system and another segment of space at the end as unallocated 1.00 MiB

I would like to recover the missing 0.35 TiB and then maybe install a partition my Linux can mount. What's on it now does not matter. I only want to use the drive for storage .


There is no missing 0.35 TiB.

TiB are measured using multiples of 2n (210 = 1024), and TB are measured using multiples of 10n (103 = 1000):

  • 3.64 TiB = 3.64*1024*1024*1024*1024 = 4002222325104 bytes
  • 4 TB = 4*1000*1000*1000*1000 = 4000000000000 bytes

The (relatively) small GB discrepancy can be found by dividing the 4 x 1012 by multiples of 1024:

  • 4000000000000 bytes / 1024 / 1024 / 1024 / 1024 = 3.63798... which after reasonable rounding is approximately 3.64.

What you will need to do though is to reformat the 4TB partition as ext4 (or NTFS/ex-FAT if you must). This is because the Linux kernel cannot write to journalled HFS/HFS+ filesystems - although I believe there is a commercial extension available from Paragon if you want to consider that.

  • Thank you both for your kind answers. But if I do as you both suggest and reformat to ext4, for instance, will the GPT partition table stay on the drive or will it be replaced by something else/be changed?
    – Georgina
    Dec 3 '18 at 16:24
  • The GPT partition table will remain unchanged, but the contents of the previous filesystem (Apple HFS/HFS+) will be erased. You can erase and recreate the GPT if you want to, since there's only the one 4TB partition.
    – roaima
    Dec 3 '18 at 16:26
  • Excellent assistance! Thank you both Christopher and roaima, will do as suggested.
    – Georgina
    Dec 3 '18 at 21:36

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.