Discrete Packet Format is the foundation of VXA technology. Data is
read and written in small packets, which include 64 bytes of user data,
error correction code, cyclical redundancy check code, and address
information. Because the packets are uniquely addressed, they can be
read in any order, and are reassembled in the buffer before being sent
back to the host.
Variable Speed Operation adjusts the tape speed to match the host
transfer rate in real time, optimizing backup and restore job times
without compromising data integrity or tape drive reliability.
Conventional streaming drives must operate at a constant speed, and when
the flow of data to or from the drive is interrupted, must stop and
reposition the tape. This "backhitching" consumes valuable job time,
accelerates media wear, and shortens the life of the mechanism.
OverScan Operation (OSO) is a
technique for reading data packets independent of track shape or the
speed at which tracks were recorded. The area scanned by all four heads
is greater than the recorded area of the tape, ensuring that each packet
is read at least once. Ultimately, this means virtually guaranteed data
retrieval and interchange.
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