13 Replies Latest reply: Apr 14, 2008 9:49 PM by scott lorigan
scott lorigan Level 1 Level 1 (65 points)
My external HD has disappeared from my desktop. If I connect it via FW it does not appear in disk utilities or system profiler but if I connect it via usb it appears in both. I've switched out the cables, tried different ports and reset the PRAM and NVRAM. Can anyone offer any suggestions as to a fix?

Thanks in advance

iMac G-5, Mac OS X (10.4.11)
  • Thomas Bryant Level 6 Level 6 (13,865 points)
    Hi! Get and run DiskWarrior. Sometimes after a restart a FW drive won't appear but after turning it off and on it will. This is likely a firmware problem with the case. Tom
  • cornelius Level 6 Level 6 (17,825 points)
    scott:

    You have done the basic troouble shooting already. You can also try shutting down the computer and the HDD, disconnecting, reconnecting the external HDD via firewire then turning it on again and rebooting the computer.

    If that does not work my guess is that you have a failed firewire bridge. You can continue to use the drive as a USB drive. If you need it as a Firewire HDD you can remove it from the current enclosure and place it in a firewire like this one at OWC. Note this enclosure has the more reliable Oxford 911+ chipset.

    Please do post back with further questions or comments.

    Good luck.

    cornelius
  • scott lorigan Level 1 Level 1 (65 points)
    Thanks for the help. I had already turned off the mac, disconnected all the cables and waited 20 minutes before reconnecting everything. I tried to boot up off DiskWarrior but, of course, it didn't see the HD since it is not on the desktop so I couldn't try to repair it. I'll try to connect it to another Mac to see if it appears there as a last resort. I can also try to talk to Apple since I still have Applecare.
  • cornelius Level 6 Level 6 (17,825 points)
    Scott:

    You have done a very thorough job of trouble shooting. I believe that confirms my diagnosis of a failed firewire bridge.

    Please keep us updated about what you find out from AppleCare.

    Good luck.

    cornelius
  • BDAqua Level 10 Level 10 (119,370 points)
    Some FW can be returned to working by removing all power, clock battery and A/CX cable included for overnight, then try to start the Mac with no memory in it. Assuming it's the Macs FW, if it's the Drives, then a new case/bridge is in order
  • cornelius Level 6 Level 6 (17,825 points)
    BD:

    The OP reports that the drive works with the USB interface, but not the Firewire. In other words, the computer is aware of the presence of the drive. In addition, the OP reports having shut down and disconnecting the computer and the drive for an extended period with the same outcome. That is the basis for my suspecting the firewire bridge.

    cornelius
  • scott lorigan Level 1 Level 1 (65 points)
    Thanks for all the assistance. As was suggested, I purchased the OWC USB/FW enclosure. The drive still does not appear on the desktop but it does appear in the "about this mac", "disk utility" and Intech "speed tools utility" but it cannot be mounted. As I mentioned in my earlier posts, I've done what I believe to be all of the trouble shooting steps available.

    If anyone has any other suggestions I would greatly appreciate them!

    Scott
  • BDAqua Level 10 Level 10 (119,370 points)
    If it now shows up in DU with both UUSB & FW, then Cornelius was right about at least one thing!

    Now it seems you must have severly damaged Directory & such on that HD, Your best bet for repairing you HD is DiskWarrior from Alsoft...

    http://www.alsoft.com/DiskWarrior/

    If that shouldn't work, your best bet for recovering your data is Data Rescue II...

    http://www.prosofteng.com/products/data_rescue.php

    This last one would require another HD with plenty of space to recover to.
  • scott lorigan Level 1 Level 1 (65 points)
    Thanks. I have DW 3.03 but am not sure how to run it since the drive does not appear when I get the choices of HD's in the DW menu. I started the mac w/c key down and the "damaged" HD does not appear. Is there another way to select the "damaged" drive?
  • cornelius Level 6 Level 6 (17,825 points)
    Scott:

    Does the drive show up in the sidebar if you launch Disk Utility? If you have data on the drive that you need to salvage, BDAqua's suggestion to use DataRescue II might be in order. Download the demo version. You can run it and see if it finds any files, then if you think it is worth it to you, you can pay for the license and get the full use of the software.

    Good luck.

    cornelius
  • scott lorigan Level 1 Level 1 (65 points)
    Yes, the drive does show up in sidebar in all three of the utilities I mentioned. I take it from your explanation that even though it appears in all three of the utilities that my only remaining option is to use DataRescue II. Correct?

    Thanks again for the advice!
  • cornelius Level 6 Level 6 (17,825 points)
    Scott:
    I take it from your explanation that even though it appears in all three of the utilities that my only remaining option is to use DataRescue II. Correct?

    Let's say that it is the only one that occurs to me at this time of night
    The demo version will at least show you that the data is still there. Another option might be to use SuperDuper to see if you can clone the User's Folder, or indeed the entire volume to an external firewire HDD, then using DU to reformat and erase the HDD (post for directions if needed) and clone back from external firewire HDD.
    Yes, the drive does show up in sidebar in all three of the utilities I mentioned.

    Is it possible to run Repair Disk in Disk Utility and see how it comes out? Or if you have done it already, what does it say?

    While in Disk Utility, select the Manufacture ID of the external HDD and then look at the look at the icons at the very top. Is Mount dimmed or active? If active, click on it to mount the HDD.

    Also, what happens if you try to Option boot?

    If anything else occurs to me I will post back in the morning.

    Cheers

    cornelius

    Message was edited by: cornelius
  • scott lorigan Level 1 Level 1 (65 points)
    I really appreciate your patience. When I open DU or about this mac the drive shows up on the left but the option of mount is dimmed. When I open Intech speed tools the "mount" option is available but after 15-20 seconds it stops without mounting.

    Appreciatively,

    Scott