Thanks Sergey, it solves my problem.

regards,

Jerry




>See http://www.berezniker.com/content/pages/visual-foxpro/enumerate-available-drives
>
>>I have a backup menu, the client can set the backup drive / folder.
>>
>>the problem is, the client set to the wrong drive, such as: F:\backupdata, while drive F: doesn't exist.
>>the program will crash.
>>
>>is there any way I can detect it's a valid drive / folder before I proceed?
>>
>>regards,
>>
>>Jerry