External disks suddenly frequently 'unreadable'

I have 2 external disks that in the past few days have been connecting unreliably to my MBP.
Sometimes I can plug them both in (via a FW hub) and both will mount immediately - as they have always done. But it's becoming just as likely that a red dialogue box will appear instead - saying (I think) 'The disk you have inserted is unreadable' (with options to erase or initialise).
Switching the disks on/off and reconnecting to the MBP works sometimes, but not always.
Rebooting the MBP, with disk still connected works sometimes, but not always.
Neither of them show up in Disk Utility when reported as 'unreadable'.
Once they mount, they stay mounted.
I have eliminated the hub (by plugging them in individually) and the 400/800 adaptor (by connecting directly to the MBP with a FW800 cable).
Since both disks started behaving in the same way at the same time (one of them is only a few months old, the other maybe 18 months old - both are Lacie d2 quadras) I wonder whether the fault may be with the MBP?
I have always been able to get the disks to mount- eventually, one way to another - so far, over the past week or so. But there is no clear course of action that works every time.
Any ideas what might be happening here, and how to fix it?

It could. It could also be that one of the supplies was weak and that drive tried to draw power from the bus and eventually caused the other one to go. As much as I like LaCie drives, though, the power supplies are sub-par.
That being said, if one of the drives is under warranty you may talk them into sending you a replacement supply at no charge to at least see if that is what is causing problems.

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    Afte install bootblk to c0t1d0s0, we tried to boot system using clone disk result (c0t1d0). We unplugged the original disk, and put the clone disk into target 0 slot (c0t0d0).
    While booting, it said that the meta database was broken and need to be repaired. we delete the metadb and re-create again --> # metadb -a -c3 -f /dev/dsk/c0t0d0s3.
    then REBOOT.
    But, after it, system won`t boot. the said that
    *"/dev/md/rdsk/d100" = no such device or address*
    */dev/md/rdsk/d100 /dev/dsk/c0t0d0s5 /dev/dsk/c0t0d0s7 = can`t check file system*
    please run fsck manually"
    we have run command "fsck". but the problem still there. System can`t boot. :-(
    But, while we put the original disk back, the system can run normally.
    Is there any steps that we are missing? Kindly need your help, please....we stuck. No idea...please response
    Thank you for any help and suggestion
    regarads,
    ferianto

    Sorry to hear.
    Other possibilities...
    Data Rescue...
    http://www.prosofteng.com/products/data_rescue.php
    (Has a Free Demo to see if it could or not, but you'll need another drive to recover to).
    rccharles on file recovery...
    "Stellar Phoenix Macintosh - Mac data recovery software, recovers data from damaged, deleted, or corrupted volumes and even from initialized disks."
    They have a trial version, so I guess you can see if your data can be recovered...
    http://www.stellarinfo.com/mac-data-recovery.htm
    FileSalvage is an extremely powerful Macintosh application for exploring and recovering deleted files from a drive or volume. FileSalvage is designed to restore files that have:
        * been accidentally deleted.
        * become unreadable due to media faults.
        * been stored on a drive before it was re-initialized/formatted.
    http://subrosasoft.com/OSXSoftware/index.php?main_page=product_info&products_id= 1

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