NT4 - drive letters keep changing, after reboots

[ruthan]

Hi,
im trying keep my drive letters settings in NT4. I have 1 SCSI disk (4 partitions) and 1 PATA disk (3 partitions).

   Im using Disk Administrator utility, im use to change drive letter on the fly, but returning back to old settings after reboot.
   In the past it usually stayed set to right settings, few it broke again, but now its breaking every boot. Now i installed Universal ATA drive, i may cause this problem, but i doubt it.
   I have tried to use Paragon and Acronis partitions managers too, but its the same.

   On Windows 2000+ i could change drive letter under registry path:
HKEY_LOCAL_MACHINE\SYSTEM\MountedDevices

I found only this:
HKEY_LOCAL_MACHINE\SYSTEM\Disk
  There are optical drivers only.

   I have tried to find drivers letter like E:  and F: but again i found only optical drivers, maybe its in NT4 settings outside of registry.

  On Windows 98, i used to use Letter assigner, but its not working on NT and so far i did not find similar utility working on NT4

   Some hint, which registry keyword to search to find this settings would be great.

Edited April 15 by ruthan