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While Windows has a built-in backup application that works with tape drives (NTBACKUP.EXE), the functions available for it from the command line are limited. This can be a problem if you want to use batch scripts or VBScript to automate how tapes are handled.
A utility called MT is a free program that emulates the functions of the UNIX mt command. Created by Peter Weston, it can work with multiple tape drives in a system by referring to them as tape0, tape1, supports tapes with variable block sizes (up to 5 MB) and allows reading and writing of individual files to tape as well as conventional tape manipulation commands such as retensioning and rewinding.
Here are some of the commands MT supports:
- drivestatus: Displays the status of all tape drives in the system
- mediastatus: Displays the status of the media in the specified tape drive
- format: Formats QIC117 tapes
- longerase: Forcibly erases everything on the specified tape partition
- shorterase: Writes an end-of-tape marker at the current position
- seekend: Moves to the end of the data in the current or specified partition
- lock/unlock: Prevents or allows the current tape to be ejected
The program also supports creating tape partitions for drives that allow it.
Note that the program writes to tape in a raw data format -- not as a stream that can be read by, say, the Windows backup program. It also doesn't create archives with redundant recovery information; it simply writes the data byte for byte. For that reason, it may not be useful as a backup solution by itself, although it you could certainly use it in conjunction with another program that creates archives with recovery information.
MT also includes the complete source code; it is distributed under the GNU software license so it can be reused freely within an organization without a licensing fee.
Serdar Yegulalp is editor of the Windows Power Users Newsletter. Check it out for the latest advice and musings on the world of Windows network administrators -- and please share your thoughts as well!