UPDATE:
Had a chance to remove the drive to take a look at it. TestDisk says the Superblock header for the 9.2.2 volume is "bad" but Gparted says it's ok. Tools on my Mac that can see the disk also think it's ok.
Since I did a disc check I now have a 'gparted_details.htm', it looks like this(as plain text, I don't know how to attach files):
GParted 1.0.0
configuration --enable-libparted-dmraid --enable-online-resize
libparted 3.2
========================================
Device: /dev/sda
Model: ATA ST500DM002-1BD14
Serial: W3TN0GLE
Sector size: 512
Total sectors: 976773168
Heads: 255
Sectors/track: 2
Cylinders: 1915241
Partition table: msdos
Partition Type Start End Flags Partition Name File System Label Mount Point
/dev/sda1 Primary 2048 974992905 boot ntfs MinWin
/dev/sda2 Primary 974993408 976773119 diag ntfs
========================================
Device: /dev/sdb
Model: ATA WDC WD3200AAJB-0
Serial: WD-WCAPZ2814890
Sector size: 512
Total sectors: 625142448
Heads: 255
Sectors/track: 2
Cylinders: 1225769
Partition table: msdos
Partition Type Start End Flags Partition Name File System Label Mount Point
/dev/sdb1 Primary 63 308383739 ext4 Linux /
/dev/sdb2 Primary 308383744 608462847 ntfs Data
/dev/sdb3 Primary 608462848 625141759 linux-swap
========================================
Device: /dev/sdc
Model: ATA WDC WD2500JB-55R
Serial: WD-WCANKH291703
Sector size: 512
Total sectors: 488397168
Heads: 255
Sectors/track: 2
Cylinders: 957641
Partition table: msdos
Partition Type Start End Flags Partition Name File System Label Mount Point
/dev/sdc1 Primary 2048 488396799 ext4 home /home
========================================
Device: /dev/sdh
Model: ST340014 DR83
Serial: 5JXBDR83
Sector size: 512
Total sectors: 78156288
Heads: 255
Sectors/track: 2
Cylinders: 153247
Partition table: mac
Partition Type Start End Flags Partition Name File System Label Mount Point
/dev/sdh1 Primary 1 63 unknown
/dev/sdh2 Primary 64 117 unknown
/dev/sdh3 Primary 118 191 unknown
/dev/sdh4 Primary 192 703 unknown
/dev/sdh5 Primary 704 1215 unknown
/dev/sdh6 Primary 1216 41580543 hfs+ Mac OS 9.2.2
/dev/sdh7 Primary 41580544 78155775 hfs+ Mac OS X.2.8
========================================
Check and repair file system (hfs+) on /dev/sdh6 00:00:03 ( SUCCESS )
calibrate /dev/sdh6 00:00:01 ( SUCCESS )
path: /dev/sdh6 (partition)
start: 1216
end: 41580543
size: 41579328 (19.83 GiB)
check file system on /dev/sdh6 for errors and (if possible) fix them 00:00:02 ( SUCCESS )
fsck.hfsplus -f -y '/dev/sdh6' 00:00:02 ( SUCCESS )
** /dev/sdh6
Executing fsck_hfs (version 540.1-Linux).
** Checking non-journaled HFS Plus Volume.
The volume name is Mac OS 9.2.2
** Checking extents overflow file.
** Checking catalog file.
** Checking multi-linked files.
** Checking catalog hierarchy.
** Checking volume bitmap.
** Checking volume information.
** The volume Mac OS 9.2.2 appears to be OK.
grow file system to fill the partition 00:00:00 ( WARNING )
growing is not available for this file system
--------------------------
Ignore everything but /dev/sdh, the other drives are from my PC.(yes I have 3 hard discs in this machine), I imagine sdd, e and f are my internal USB card reader.
NOTE: I did not give a grow command but for some reason, GParted does a grow of 0% when you do a check disk.(I guess it has to do something to do a check disc)