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adaptec ACS-100 Enclosure for 3.5" HDD to USB - suddenly, no drive letter!

Posted on 2006-10-23
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Last Modified: 2010-05-18
W2K SP4

adaptec ACS-100 Enclosure for 3.5" HDD to USB

3.5"" HDD to use above enclosure:  Maxtor DiamondMax Plus 8 40GB

It worked on any Pc, laptop with either W2K or XP Pro. Jumper on Maxtor has to be in Master position, otherwise "USB Mass Storage Device" shows "This device cannot start. (Code 10)".

now, with jumper in Master position, "USB Mass Storage Device" shows "device working properly" but NO drive letter!

When using USB 4gb stick (not at the same time with Adaptec enclosure), it works ok - always drive letter.

Why is drive letter suddenly not appearing for Adaptec hdd-to-USB enclosure?
thanks.
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Question by:trial2006
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by:nobus
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possible solutions :
-it takes the letter from an existing device, and cannot.
-try giving a fixed drive letter : http://www.uwe-sieber.de/usbdlm_e.html
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by:trial2006
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nobus,

thanks but  usbdlm still does not make my drive letter visible.
I wrote to Uwe ...

In W2K:
Computer Management/Storage/Disk Management
shows  "Disk 2: Basic,  38.28GB, Online,  UNallocated"

how I can make above "Disk 2"  ALLOCATED in "Disk Management"  WITHOUT deleting
existing data and/or starting partitioning?

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nobus earned 500 total points
Comment Utility
you may have to use data recovery software, among whoch GetDataBack and Stellar have a very good record  :
http://www.pcworld.com/downloads/collection/0,collid,1295,00.asp            Free Recovery
http://www.pcinspector.de/file_recovery/UK/welcome.htm                  pc Inspector
http://www.runtime.org/                                    GetDataBack
http://www.stellarinfo.com/                                    Stellar
http://www.recovermyfiles.com/                              RecoverMyFiles
http://www.bitmart.net/                                    Restorer 2000
http://www.ontrack.com/easyrecoveryprofessional/                  Easy Recovery
http://www.snapfiles.com/get/restoration.html                        Restoration
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Author Comment

by:trial2006
Comment Utility

nobus,

thanks for the list, but why would I use data recovery ? I am not saying that my hdd is bad.
Or you think otherwise?
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Expert Comment

by:nobus
Comment Utility
because you can loose the data by making it allocated.
you can try this :
USB no drive letter
delete the following key with regedit and reboot :
HKEY_LOCAL_MACHINE SYSTEM CurrentControlSet Enum USBSTOR
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Author Comment

by:trial2006
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nobus,

I used GetDataBack and recovered directory tree and files. But what worries me is :

1) last Fri I put my hdd in the hdd-to-usb enclosure and connected to one Xp Home pc,
backed up data successfully, and then properly disconnected usb enclosure.

2) on Sun, when I repaired that XP Home Pc, i connected usb enclosure back, only to
my surprise that hdd in the usb enclosure is not 'visible' .  
I then tried to 'see' my hdd by connecting my sub enclosure to other PCs (W2K, XP pro) -
but to no avail.

3) only THEN is when I look into "Disk Management" and UN/allocated issue, BUT never ever
proceeded to the end of Disk Management's partitioning (with no formatting option) wizard.

4) So my hdd became 'invisible' BEFORE I even touch disk management and allocation issue.
It became 'invisible' between the steps 1. and 2. above!!!

Q1:
Why?  I just moved back and forth  hdd jumper to master and slave positions, that's all.
And of course, turned Adaptec usb enclosure's power on/off.

Q2:
Now, when I partition and format my hdd again, how to protect it from being 'invisible'
again when I use it in the Adaptec USB enclosure on various machines?
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Author Comment

by:trial2006
Comment Utility
correction above:

...
2) on Sun, when I repaired that XP Home Pc, i connected usb enclosure back, only to
my surprise that hdd in the usb enclosure is not 'visible' .  
I then tried to 'see' my hdd by connecting my USB enclosure to other PCs (W2K, XP pro) -
but to no avail.
....

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Expert Comment

by:nobus
Comment Utility
In most cases, it is due to installing drivers, or an upgrade.  --> try a system restore to a previous date
And you cannot "protect" it; just keep a backup of the data. The USB protocol is not nearly as stable as the IDE is.
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