Hello all I am using USBASPI.SYS v2.20 for accessing data from USB pen drive. I am able to access it with DOS = UMB in CONFIG.SYS. But due to some memory require I tried to put DOS=HIGH,UMB but it now gives "Invalid Media type reading drive D" message and system hangs. I have following lines in my CONFIG.SYS file LASTDRIVE=Z DOS=HIGH,UMB DEVICE=HIMEM.SYS DEVICE=USBASPI.SYS DEVICE=DI1000DD.SYS Thanks to all those who are helping me. bye.

I think you need to load himem.sys before the DOS=HIGH,UMB and it should work. HTH.

The 'invalid media type reading drive d:' indicates d: isn't formatted. That doesn't sound like it would be related to config.sys. The first few lines of config.sys should probably be something like: DEVICE=HIMEM.SYS DEVICE=EMM386.EXE NOEMS DOS=HIGH,UMB then the various other driver lines would follow. You also may need to preface the commands with a path, such as: DEVICE=C:\DOS\HIMEM.SYS or DEVICE=C:\WINDOWS\HIMEM.SYS depending on the file's location.