Connecting two large FAT32 drives - one doesn't mount

I have two WD 2TB HDDs formatted as FAT32. One is in a 4-bay external box connected via eSATA, the other in a WD case connected via USB. My computer is a Powermac Dual G5 2.0GHz running 10.4.11
Connecting either box individually leads to no problems, i.e. volume mounts and is available for use. So I have confidence in the formatting, drives and cables.
However when I try to connect both at the same time, only one loads correctly (the eSATA one as it loads quicker). The USB drive can be seen by Disk Utility but the volume is greyed out and using the Mount button does nothing - though on some occassions it asks for administrator name and password (entering these does nothing).
If I startup with only the USB connected then it loads ok but if I then connect the eSATA I have the same issue but with the eSATA drive volume greyed out.
Can OSX mount multiple FAT32 drives?
Cheers
Nick

USB External drive is a 2TB Western Digital 3.5" Elements with external power supply.
eSATA box is a 4-bay ICYBOX unit with 2TB Western Digital drive. ICYBOX has its external own power supply.
As both drives are externally powered rather than bus powered I wouldn't think it is a power problem.
TheICYBOX also has USB connection and the same occurs via that, so I don'tthink it is eSATA. I've also put the drive into another eSATA case withsame issue, so I don' think it is the ICYBOX.
Finally,I've tried with another external 1TB Western Digital 2.5" Elementsdrive; same issue, drive in eSATA box mounts, external drive doesn't.
From memory I've been able to simultaneously mountthe ICYBOX and a 320GB Western Digital 2.5" Elements drive, but I'llcheck that again (hence my thought about ht eproblem being due to largeFAT32 drives)
Cheers
Nick

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Spain: 900 99 71 21 (Número Gratuito)
France: 0800 908 621 (Numéro Vert)
Germany: +49 89 450 53199
Italy: 800 877 224
United Kingdom: +44 1276 803 299
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