WriteTapemark info  Overview  Group

The WriteTapemark function writes a specified number of filemarks, setmarks, short filemarks, or long filemarks to a tape device. These tapemarks divide a tape partition into smaller areas.

DWORD WriteTapemark(

HANDLE hDevice,	// handle to open device
DWORD dwTapemarkType,	// type of tapemarks to write
DWORD dwTapemarkCount,	// number of tapemarks to write
BOOL bImmediate	// return after write begins
);

Parameters

hDevice

Identifies the device on which to write tapemarks. This handle is created by using the CreateFile function.

dwTapemarkType

Specifies the type of tapemarks to write. This parameter can be one of the following values:

Value	Description
TAPE_FILEMARKS	Writes the number of filemarks specified by the dwTapemarkCount parameter.
TAPE_LONG_FILEMARKS	Writes the number of long filemarks specified by dwTapemarkCount.
TAPE_SETMARKS	Writes the number of setmarks specified by dwTapemarkCount.
TAPE_SHORT_FILEMARKS	Writes the number of short filemarks specified by dwTapemarkCount.

dwTapemarkCount

Specifies the number of tapemarks to write.

bImmediate

Specifies whether to return as soon as the operation begins. If this parameter is TRUE, the function returns immediately; if it is FALSE, the function does not return until the operation has been completed.

Return Values

If the function succeeds, the return value is NO_ERROR.

If the function fails, the return value is one of the following error codes:

Error	Description
ERROR_BEGINNING_OF_MEDIA	An attempt to access data before the beginning-of-medium marker failed.
ERROR_BUS_RESET	A reset condition was detected on the bus.
ERROR_END_OF_MEDIA	The end-of-tape marker was reached during an operation.
ERROR_FILEMARK_DETECTED	A filemark was reached during an operation.
ERROR_SETMARK_DETECTED	A setmark was reached during an operation.
ERROR_NO_DATA_DETECTED	The end-of-data marker was reached during an operation.
ERROR_PARTITION_FAILURE	The tape could not be partitioned.
ERROR_INVALID_BLOCK_LENGTH	The block size is incorrect on a new tape in a multivolume partition.
ERROR_DEVICE_NOT_PARTITIONED	The partition information could not be found when a tape was being loaded.
ERROR_MEDIA_CHANGED	The tape that was in the drive has been replaced or removed.
ERROR_NO_MEDIA_IN_DRIVE	There is no media in the drive.
ERROR_NOT_SUPPORTED	The tape driver does not support a requested function.
ERROR_UNABLE_TO_LOCK_MEDIA	An attempt to lock the ejection mechanism failed.
ERROR_UNABLE_TO_UNLOAD_MEDIA	An attempt to unload the tape failed.
ERROR_WRITE_PROTECT	The media is write protected.

Remarks

Filemarks, setmarks, short filemarks, and long filemarks are special recorded elements that denote the linear organization of the tape. None of these marks contain user data. Filemarks are the most general marks; setmarks provide a hierarchy not available with filemarks.

A short filemark contains a short erase gap that cannot be overwritten unless the write operation is performed from the beginning of the partition or from an earlier long filemark.

A long filemark contains a long erase gap that allows an application to position the tape at the beginning of the filemark and to overwrite the filemark and the erase gap.

See Also

CreateFile