Comment 57 for bug 734883

I'm having difficulty mounting a 6TB G-Technology external HD. I believe it is exactly as with the others here:
:~$ dmesg | tail
[ 486.336116] sd 8:0:0:0: [sdh] Mode Sense: 10 00 00 00
[ 486.337902] sd 8:0:0:0: [sdh] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[ 486.341258] sd 8:0:0:0: [sdh] Very big device. Trying to use READ CAPACITY(16).
[ 486.487318] sdh: sdh1 sdh2
[ 486.492396] sd 8:0:0:0: [sdh] Very big device. Trying to use READ CAPACITY(16).
[ 486.531355] sd 8:0:0:0: [sdh] Attached SCSI disk
[ 487.000868] hfs: invalid secondary volume header
[ 487.000873] hfs: unable to find HFS+ superblock
[ 494.612178] hfs: invalid secondary volume header
[ 494.612183] hfs: unable to find HFS+ superblock