In the following example, Microsoft Visual FoxPro compares the available disk space with the amount needed to sort customer.
*** Check DISKSPACE before a SORT ***
CLOSE DATABASES
OPEN DATABASE (HOME(2) + 'Data\testdata')
USE customer && Opens Customer table
*** Get size of table header ***
gnTableHead = HEADER( )
*** Calculate size of table ***
gnFileSize = gnTableHead + (RECSIZE( ) * RECCOUNT( ) + 1)
IF DISKSPACE( ) > (gnFileSize * 3)
WAIT WINDOW 'Sufficient diskspace to sort.'
ELSE
WAIT WINDOW 'Insufficient diskspace. Sort cannot be done.'
ENDIF