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Help mounting EFI GPT partition 
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Joined: Mon Aug 25, 2008 00:09
Posts: 2
Post Help mounting EFI GPT partition
Hi, I've recently installed gentoo and ntfs-3g. I've got 2 raid arrays on a hardware card, both formatted NTFS although one is over 2TB and formatted with GUID partition tables by vista. The smaller array (sda) mounts without problems but the GPT array (sdb) fails to mount as indicated below:

# mount /dev/sdb1 /big -t ntfs-3g
NTFS signature is missing.
Failed to mount '/dev/sdb1': Invalid argument
The device '/dev/sdb1' doesn't have a valid NTFS.
Maybe you selected the wrong device? Or the whole disk instead of a
partition (e.g. /dev/hda, not /dev/hda1)? Or the other way around?

Attached is an fdisk -l which confirms that the disk is GPT

# fdisk -l
Disk /dev/sda: 1500.0 GB, 1500084436992 bytes
255 heads, 63 sectors/track, 182374 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x370d74e1

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1               1      182374  1464919123+   7  HPFS/NTFS

WARNING: GPT (GUID Partition Table) detected on '/dev/sdb'! The util fdisk doesn't support GPT. Use GNU Parted.

Disk /dev/sdb: 3000.3 GB, 3000370200576 bytes
256 heads, 63 sectors/track, 363349 cylinders
Units = cylinders of 16128 * 512 = 8257536 bytes
Disk identifier: 0x00000000

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1               1      266306  2147483647+  ee  EFI GPT

How do I mount this with ntfs-3g please? Am I missing something obvious? Do I need to use something in addition to ntfs-3g?

Thanks for your time

Mon Aug 25, 2008 00:17
Tuxera CTO

Joined: Tue Nov 21, 2006 23:15
Posts: 1648

The answer was included in your 'fdisk -l' output:
The util fdisk doesn't support GPT. Use GNU Parted.

So, don't use fdisk but Parted to figure out what your NTFS partition is. Probably it's /dev/sdb2.

Mon Aug 25, 2008 02:47

Joined: Mon Aug 25, 2008 00:09
Posts: 2
Thanks, that got me on the right track. First off I used:

#partprobe /sdb

which revealed sdb2 to the OS and ntfs-3g could mount that without issues. I then put together a script that ran in local.start which partprobed then mounted the partition manually.

This was a bit hacky though so I looked into why it wasn't being seen by the OS. GPT wasn't compiled in my kernel! I added that and now sdb2 is available on boot and I can mount in fstab.

Thanks very much!

Mon Aug 25, 2008 19:32
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