HP LTO 4 SAS, LTO 4 FC, LTO 4 SCSI manual see ”read-while-write”

offline	The drive is offline if the tape is currently unloaded or not in the drive. The host has
	limited access, and cannot perform any commands that would cause tape motion. The
	host can, however, load a tape, if one is inserted, and can execute any diagnostic tests
	that do not require tape motion.
online	The drive is online when a tape is loaded. The host has access to all command
	operations, including those that access the tape, set configurations and run diagnostic
	tests.
RWW	see ”read-while-write”
read-while-write	RWW improves data integrity by reading data immediately after it is written and
	writing the data again if an error is found.
TapeAlert	A set of 64 flags is held in the TapeAlert log that indicate faults or predicted faults with
	the drive or the media. By reading this log, host software can inform the user of
	existing or impending conditions, and can, for example, advise the user to change the
	tape.
WORM	Write Once, Read Many

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