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 C_ISDISK()

 DESCRIPTION

 C_ISDISK() determines whether the specified drive is a valid drive
 on the current system.

 NOTES

 C_ISDISK() includes a ramdisk as a valid drive on the system.

 SYNTAX

 C_ISDISK(drive)

 PARAMETERS

 drive (C) is the drive letter to check.  The drive letter must be
 specified as a character (A, B, C, etc.).

 RETURNS

 C_ISDISK() returns true (.T.) if the specified drive is a valid
 drive, or false (.F.) if it is not.

 EXAMPLES

 && System has 4 drives: A, B, C, and D.

 c_isdisk("A")  --> .T.
 c_isdisk("C")  --> .T.
 c_isdisk("Z")  --> .F.