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mking007
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External hard drive (USB) not visible in disk management and my computer

Please help. I've been searching everywhere for a solution to this problem....finding a lot of questions that sound the same but I still have the problem.
 
I have an external Iomega 80GB USB drive that used to work fine (I think up to c. 2 months ago) but I have recently noticed has a problem. I use it to backup data and so it may be a couple of months in between uses. When I power the drive on it is no longer visible in My Computer. When I look in Disk Management it is not visible there, however it is visible in Device Manager under "disk drives" and as "USB Mass Storage Device" under USB Controllers.
 
The desktop PC I'm using is a Dimension 8400 with XP Pro.
 
I know the drive works fine as I can see it from another PC (laptop running Win 2000).
 
I know the USB ports work fine on the problem PC, as I've used a digital camera with it and sure enough the camera's hard drive is visible in Disk Management and My Computer.
 
I've tried uninstalling from device manager - no joy.
I've tried a selective load from msconfig - no joy.
 
When I look in "Disk Management" the refresh takes a long time and then only shows my CR-ROM and C-drive. When I boot the PC it takes a while to load, whereas when I boot with the external drive powered down it boots very quickly. Does this give anyone any ideas?
 
Any help greatly appreciated.
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Moderator
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Re: External hard drive (USB) not visible in disk management and my computer

mking007,

* Disconnect the hard disk drive from the system
* Click Start- Shutdown- Restart- OK or Click Start- Turn Off Computer- Restart
* Connect the powered on hard disk drive to a rear USB port

What appears?
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RoHe
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Re: External hard drive (USB) not visible in disk management and my computer

Did you by chance update your 8400 to BIOS A06 recently? Lots of users have reported problems with A06 when USB devices are attached at bootup. If you have BIOS A06, you may want to go back to A05 and see if that fixes the problem.

Also check the boot sequence in BIOS that the internal HD is first, and make sure that you've disabled boot from USB in BIOS. If the USB drive doesn't have the OS, the system may have to wait for that drive to time out before it boots from the internal HD. And make sure you have the latest version of Dell's Desktop System Software which fixes some USB problems on the 8400.

Ron

Ron

Forum Member since 2004
I am not a Dell employee

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mking007
Bronze

Re: External hard drive (USB) not visible in disk management and my computer

Dear Chris M.,

When I re-start as per your instructions:

1. The PC starts quickly. However, if the drive was connected the USB port then it "stalls" for a while. It doesn't hand but it does pause

2. When I re-connect to the USB I hear the "detect new hardware" noise straight away but don't see any of the "installing new hardware" stuff - I hadn't uninstalled it, just disconnected as per your mail.

3. When I look in My Computer the new drive isn't there. If I look in Disk Management it "pauses" for a while (c. 1 min) saying "Connecting to Logical Disk Manager Service". The new drive isn't visible in the Disk Management window - just my C-drive and CD-ROM

4. If I look in Device Manager the drive is visible under Disk Drives as "IC35L090 AVV207-0 USB Device" and under USB controllers as "USB Mass Storage Device"

Any ideas appreciated.

Michael

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mking007
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Re: External hard drive (USB) not visible in disk management and my computer

Dear RoHe

I have recently upgraded to BIOS A06, but I think (I've tried so many things it begins to blur)...I think I did this after this problem occurred. I've gone back to A05 (I think I was on A04 before) and it's not made any difference.

I have downloaded the latest version of Dell's Desktop System. No difference.

I've checked the boot sequence and it's as follows:

1. Onboard or USB Floppy drive

2. Onboard SATA hard drive

3. Onboard or USB CD-ROM drive

That looks ok to me.....?

I've just plugged in a digital camera to compare. The camera is recognised - made available as drive E and is visible in Disk Management. The Iomega drive is still not visible in either of these, but is visible in device manager.

Again, any suggestions appreciated.

Michael

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RoHe
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Re: External hard drive (USB) not visible in disk management and my computer

Michael,
There's at least part of your problem. You have 'Onboard or USB Floppy drive' listed first in the boot sequence. Change it so 'Onboard SATA hard drive' is first.

Use the Up/Down arrows to move Onboard SATA to top of the list, and you probably want to put 'Onboard or USB CD-ROM drive' second on the list. If you don't have a floppy, you can just delete that one. Then make sure to set the boot options to 'USB-no boot' too.

Ron

Ron

Forum Member since 2004
I am not a Dell employee

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mking007
Bronze

Re: External hard drive (USB) not visible in disk management and my computer

Dear All,
 
This problem has escalated - I'm having a bad day!
 
I had tested the IOmega external HDD with a second PC (also running XP Pro). The drive was detected and available in My Computer perfectly.
 
I looked for differences between the two PC setups and discovered that in Device Manager/Disk Drives the good PC only had two files (PartMgr.sys and disk.sys) whereas the malfunctioning PC had these two files as drivers as well as a third - iomdisk.sys.
 
I have had little or no help from Iomega as to how to remove this file, but it was suggested that I could rename it and see if that helped.
 
I renamed it 111iomdisk.sys and now can't start my PC!!! I'm writing this on the second PC. I seem to be stuck in a loop where I can't boot into DOS to rename the file back to iomdisk.sys. The resource CD and Windows CDs don't seem to be able to boot me into windows or DOS.
 
Please help me to rename this file so that windows boots ok.
 
Many thanks in advance.
 
Michael
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RoHe
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Re: External hard drive (USB) not visible in disk management and my computer

Michael,
Boot the PC and immediately press F2 to get into BIOS setup. Change the boot sequence so that CD-ROM is first. Now put the XP CD in the drive and close the drawer, save the BIOS changes and exit. It should boot from the XP CD.

See if you can rename that file now. Not sure you'll have that authority because there are only limited things you can do when booting this way for obvious security reasons. If you can't rename it, try running msconfig. Go to the startup tab in msconfig and uncheck everything related to Iomega. Otherwise, try uninstalling the drive in device manager. Whichever way (hopefully) works, reboot, enter BIOS setup and change the boot sequence back to SATA HD first. Then you can fix the drive installation. You may ultimately have to uninstall and reinstall it to get back to the way it was before.

And stop changing file names, unless you're positive... Smiley Wink

Ron
One more thought. iomdisk.sys is actually included with XP, so if none of the above works, you may have to do an XP Repair Reinstall. That's not a new installation so all your personal files and settings should survive. Read Dell's document FA1056993 about doing a Repair Reinstall of XP and follow the instructions. You will have to install all the Windows hotfixes and updates again. So as soon as it's running again and your firewall is enabled, go to the MS site and download all the updates.

Message Edited by RoHe on 08-10-2005 06:35 PM

Ron

Forum Member since 2004
I am not a Dell employee

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mking007
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Re: External hard drive (USB) not visible in disk management and my computer

Dear Chris M and RoHe,

After a long and frustrating recovery I've ended up re-formatting my hard drive. Long story - most (all) of it my fault!

I now have a relatively clean PC that only has XP Pro and Office installed - not a lot of the other USB apps that I use e.g. digital camera, scanner....

However, to my amazement my original problem is still there! When I connect the Iomega HDD via USB it is not recognised in My Computer or Disk Management. It does appear in Device Manager under Disk Drives and USB COntrollers as a Mass Storage Device.

The drive was available earlier in the re-build process, although I don't exactly exactly which update changed this. Therefore I'm wondering if this is a Service Pack 2 issue.....?

Again, any help greatly appreciated.

M

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RoHe
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Re: External hard drive (USB) not visible in disk management and my computer

Did you install the chipset driver immediately after reinstalling XP, followed in order by video driver, audio driver, and then the other drivers?

See if anything here will help:
https://iomega-na-en.custhelp.com/cgi-bin/iomega_na_en.cfg/php/enduser/std_adp.php?p_faqid=1235&p_created=1072727206&p_sid=pq8gPQMh&p_lva=500&p_li=

Ron

Message Edited by RoHe on 08-12-2005 12:09 PM

Ron

Forum Member since 2004
I am not a Dell employee

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