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Lets say I need to map folder C:/D as drive D:

One can use SUBST command to map folder as drive in Windows. 

SUBST d: C:/D

I am absolutely happy how SUBST does the work. So I set this command as a startup task using the task manager.

A problem here is that if I have a flash in a USB port while booting Windows, the flash is got mapped as D: and SUBST fails.

The question is how to make C:/D to be D: permanently. So other drives (especially flash drives) don't break this during startup.

P.S. I know I could set D: to be R: which is unlikely to conflict with other drives. But I would greatly appreciate another answer.

MajesticRa
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2 Answers2

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I found some posts here, apparently you can make it persistent with a registry modification: How to make SUBST mapping persistent across reboots?

Granted I haven't tried this myself...

Community
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Ross Aiken
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    Thank you very much. Indeed using the "...\Session Manager\DOS Devices" registry entry solved the problem with early drive initialization. – MajesticRa Apr 06 '12 at 09:40
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you can use this utility to solve the conflict. it is called USB Drive Letter Manager for Windows.

http://www.uwe-sieber.de/usbdlm_e.html

johnshen64
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  • Thank you very much. The tool allows to set new usb letters. This could help for usb. But there could be not-USB-disks inserted too. I really would love a solution how to 'reserve' disk letter to use it. Some system policy maybe... – MajesticRa Apr 05 '12 at 21:59