fairly certain that you need ASPIDISK.SYS or some equivalent to actually get drive letter access and possibly set the drive letter that will be used.

I was able to get it to work. I found ATTRIB online, but it doesn't work on Win98 DOS.

I need a way to either swap files or set the flash drive to a certain drive letter.

try assign or subst

I am familiar with SUBST, but it can't do what I need it to do. 🙁 I need to change the drive letter. SUBST merely reroutes a drive to another.

try assign

I tried ASSIGN. The command is not available. 🙁 I was in the process of getting a DOS version in the hopes that it would work but stopped because I don't think it would do what I need it to do: change the drive letter rather than just creating an alias.

Harry Potter wrote on 2022-06-06, 12:41:

I tried ASSIGN. The command is not available. 🙁 I was in the process of getting a DOS version in the hopes that it would work but stopped because I don't think it would do what I need it to do: change the drive letter rather than just creating an alias.

Which ASPI layer are you using - have you tried Di1000dd.SYS which allows you to set the drive letter using the /dL switch

Couple of links worth reading...

http://ps-2.kev009.com/basil.holloway/ALL%20TXT/DOSusb.txt
https://msfn.org/board/topic/141875-how-to-in … drivers/page/2/

I have the utility but not sufficient docs. 🙁 How do I format the /dL switch?

PC Hoarder Patrol wrote on 2022-06-06, 12:46:

http://ps-2.kev009.com/basil.holloway/ALL%20TXT/DOSusb.txt

I'm gonna let you have this one 😀

Harry Potter wrote on 2022-06-06, 12:50:

I have the utility but not sufficient docs. 🙁 How do I format the /dL switch?

Try following this text from the first link I posted...just change the drive letter in the /d switch to whatever you want it to be

DI1000DD.SYS ASPI Disk Driver v2.00 from Novac Co., Ltd […]
Show full quote

DI1000DD.SYS
ASPI Disk Driver v2.00 from Novac Co., Ltd

device=[{path}]DI1000DD.SYS [/hN] [/dL]

If USBASPI.SYS detects multiple mass storage devices on multiple host adapters, use
/hN Host, to specify which host adapter to map drive letter(s), where N would be the 3rd number set reported for the USB controller in USBASPI.SYS with the /v switch.

To specify the starting drive letter for detected mass storage devices, use
/dL Drive_letter, where L is the first assigned letter for this host adapter

Example of use:

If you want specify the "L" drive letter for a storage
device, try:

device[high]=[{path}]di1000dd.sys /dL

I figured out the switch. It worked but only in DOS mode. In Windows mode, it killed most of the other drives. 🙁

Harry Potter wrote on 2022-06-06, 13:29:

I figured out the switch. It worked but only in DOS mode. In Windows mode, it killed most of the other drives. 🙁

TBH I'm not totally sure this is even designed for generic flash drives, so I don't know if you'd have any better luck with this; the Windows driver install package...start the “Add New Hardware Wizard” with the flash drive plugged in then following any prompts, navigate to the directory where you unzipped the files and select NVUSAT2.INF followed by NVUSAT2S.INF if prompted to do so.