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External drive problem

1917 Views 9 Replies Latest reply: Jul 1, 2010 12:35 PM by Chris Blackwell1 RSS
Chris Blackwell1 Calculating status...
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Jun 28, 2010 3:52 PM
I have a new iMac 27" and I am having a problem with my external drives. They keep unmounting themselves and I have to switch them on and off or disconnect the FW cable in order to get them back. This is annoying because one of them is my Time Machine drive.

Two of the drives are G-Tech minis (bus powered) and the other two are G-Tech 1TB drives (powered). The FW cable is daisy chained from drive to drive, the powered 1TBs first and the unpowered 500GB G-Tech minis last.

Any ideas?
Intel 27" iMac, Mac OS X (10.6.3), 8GB RAM 3.06 dual core
  • JaimieV Level 2 Level 2 (490 points)
    Currently Being Moderated
    Jun 28, 2010 5:46 PM (in response to Chris Blackwell1)
    First thing I'd suspect is that there isn't enough bus power to keep the two unpowered drives live. Try reordering them, I'd suggest either
    iMac-powered-unpowered-powered-unpowered or
    iMac-unpowered-powered-unpowered-powered.
    iMac i5 2009; MBP 13" late '09; Air '07; Mini '09; Mini '07, iPhone 3GS, 2G, Mac OS X (10.6.4), Airport Extreme, Netgear ReadyNAS NV+, Netgear GigE
  • rkaufmann87 Level 8 Level 8 (40,740 points)
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    Jun 28, 2010 5:47 PM (in response to Chris Blackwell1)
    It might be something as simple as a SMC and/or PRAM reset. Give those a try and let us know if there is a change. If not then we can start troubleshooting to see where problem actually is.

    Regards,

    Roger
    iMac and Macbook Pro, Mac OS X (10.6.4), iPhone 3GS Airport Extreme Airport Express
  • R C-R Level 6 Level 6 (13,855 points)
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    Jun 29, 2010 4:03 AM (in response to Chris Blackwell1)
    I'm not very familiar with G-Tech drives but some external drives have power-saving modes that do not pass Firewire power from port to port when that mode is in use. I suggest checking your G-Tech user manuals or contacting G-Tech support to see if this might be your problem & what to do about it.
    2008 iMacs: 24"/3.06 GHz + 20"/2.66 GHz; White MacBook/2.4 GHz, Mac OS X (10.6.4), Kensington Trackball; Airport Extreme 802.11n; assorted iPods and older Macs
  • elmac Level 5 Level 5 (4,230 points)
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    Jun 29, 2010 6:12 AM (in response to Chris Blackwell1)
    Hi, I have the same Issue with just one of my WD EHD..3 other WD's are Ok & 2 LaCie's are Ok
    After contacting WD - they could NOT give me an explanation..As suggested try the SMC & PRAM reset route..One other question - are the EHD plugged directly into the Mac or are you using a Hub?..L
    4 Macs - 2 iPhones - 7iPods - 3Leica's - 2Nikon's, Mac OS X (10.6.4), Use em all" - Luv em All" - Need em all!!
  • JaimieV Level 2 Level 2 (490 points)
    Currently Being Moderated
    Jun 30, 2010 4:18 AM (in response to Chris Blackwell1)
    fw800 hubs do exist, though not cheaply. eg http://www.google.co.uk/products?q=fw800 hub

    Did you try my ordering suggestions above without success? Now I've thought further,

    iMac-unpowered-unpowered-powered-powered

    might be better.
    iMac i5 2009; MBP 13" late '09; Air '07; Mini '09; Mini '07, iPhone 3GS, 2G, Mac OS X (10.6.4), Airport Extreme, Netgear ReadyNAS NV+, Netgear GigE

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