I have an external hard disk with 6 partitions and I have assigned the letters U: to Z:. Now, every time I reboot, X,Y,Z or at times W,X,Y,Z are assigned new drive letters by the system (W2k/SP4). I have to reassign them each time. Designations are not all exhausted. Any solutions? Sourin

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Why did you start at U? What about your CD-Rom drive? Why would you want to partition an external drive? Removable drives can, by nature, can lose the drive letter assignment. They are removable drives. Keeping drive letter for removable drives is a pain. More about this is in the Microsoft database
Or, look at this:
http://www.informit.com/articles/article.aspx?p=19409&rl=1
Also, do a Google search on this topic: “Chnage drive letters”

Geek9pm

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I'd recommend a limit of four partitions for an external hard drive.

I have two 400 GB external HD's (with four partitions), and from within XP's Disk Management I assigned them the letters Q,R,S and T. I assigned my single partition 120 GB external drives the letter U.

These drives have stuck to the assigned letters. In other words, plug in one 120 GB drive and it comes up as "U", even though letters "QRST" are available.

I assigned two of my pocket flash drives as "V", and they stick to that letter, even if letters "QRSTU" are available.

Of course, plug in more than one of the same device, and the second one will have to use later letters.

I haven't tried to assign a letter in Disk Management to an external optical drive (I have one Plextor CD-RW and one Sony DVD±RW, for external drives, both mostly used with my laptop...).

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Athlon 1.1 - 768 MB RAM = 98SE & XP Home

Athlon 3000+ 64 - 1024 MB RAM = 98SE (@768 MB RAM) & XP Pro

IBM ThinkPad PIII 933 - 384 MB RAM = 98SE & XP Pro SP2

Windows 2000 Server in the basement

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I have never seen this issue. The only data I could find that might be related was 
to be sure a unique LABEL was on each partition.
I am assuming you assigned the letters in the order you created the partitions, such 
that they are physically in order. If not, they are probably being assigned the same 
letters (although different from what you want) every time.

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Just to clarify, on the 400 GB drives, I assigned Q,R,S and T to partitions 1,2,3 and 4 (in sequential order), and each partition has its own volume label (Programs, Music, Videos and Photos).

==================================

Athlon 1.1 - 768 MB RAM = 98SE & XP Home

Athlon 3000+ 64 - 1024 MB RAM = 98SE (@768 MB RAM) & XP Pro

IBM ThinkPad PIII 933 - 384 MB RAM = 98SE & XP Pro SP2

Windows 2000 Server in the basement

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Thanks for the many replies. To clarify:- System: 2x Intel Pentium IIIE, 933 MHz (7 x 133) ASUS CUV4X-D MotherBoard// Mem: 512 MB// 2-physical drives:C-D-E-F and G-H-I-J [60GB & 80GB]// 2-CD/DVD drives: S & T// EHD: U-V-W-X-Y-Z (160GB)// OS:Dual boot - XP on D: and W2k on H:// Problem: XP booting keeps the drive letters as assigned. W2k booting changes W-X-Y-Z to K-L-M-N but keeps the CD/DVD designations.// I have 6 computers connected via Ethernet. All have dual boot and all have similar drive designations. Other computers keep the drive designations. Where are these assignments stored?

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