I want to backup Sybase IQ 16 Database to a USB external Drive (F:\) by script:
BACKUP DATABASE TO 'F:\Sybase Backup\BISYBASEIQ_bk_20150111'

However, receive an error:
Error during backup/restore: unable to determine disk freespace on F:\Sybase Backup\BISYBASEIQ_bk_20150111

PS: I have granted 'Full control' permission to all user accounts just in case.

Please kindly advice, many thanks!