PrepareTape

The PrepareTape function prepares the tape to be accessed or removed.

DWORD PrepareTape(

HANDLE hDevice,	// handle of open device
DWORD dwOperation,	// preparation method
BOOL bImmediate	// return after operation begins
);

Parameters

hDevice

Identifies the device preparing the tape. This handle is created by using the CreateFile function.

dwOperation

Specifies how the tape device is to be prepared. This parameter can be one of the following values:

Value	Meaning
TAPE_FORMAT	Performs a low-level format of the tape. Currently, only the QIC117 device supports this feature.
TAPE_LOAD	Loads the tape and moves the tape to the beginning.
TAPE_LOCK	Locks the tape ejection mechanism so that the tape is not ejected accidentally.
TAPE_TENSION	Adjusts the tension by moving the tape to the end of the tape and back to the beginning. This option is not supported by all devices. This value is ignored if it is not supported.
TAPE_UNLOAD	Moves the tape to the beginning for removal from the device. After a successful unload operation, the device returns errors to applications that attempt to access the tape, until the tape is loaded again.
TAPE_UNLOCK	Unlocks the tape ejection mechanism.

bImmediate

Specifies whether to return as soon as the preparation 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

Some tape devices do not support certain tape operations. See your tape device documentation and use the GetTapeParameters function to determine your tape device's capabilities.

See Also

CreateFile, GetTapeParameters

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