Recording Method; Data Buffer; Data Integrity; Figure 10. Layout Of Tracks On Lto Ultrium Tape - Certance LTO-2 Online User's Manual

Theory
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5
Beginning of
tape (BOT)
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Figure 10. Layout of Tracks on LTO Ultrium Tape

Recording Method

The LTO-2 half-height drive records data using write-equalized (1,7) Run Length Limited (RLL) code.
RLL (1,7) Data bits are defined as follows:
A ONE is represented by a flux transition at the center of a bit-cell.
•
A ZERO is represented by no flux transition in the bit-cell.
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Data Buffer

In their default configuration, the LTO-2 half-height drive has a 32-Mbyte buffer. The buffer controller
has a burst transfer rate of 320 Mbytes/sec. The high bandwidth is needed to support look-aside
data compression in the case of compressible data being transferred from SCSI at 160 Mbytes/sec.

Data Integrity

The mechanical and electrical design of the drives ensures that drive performance does not degrade
over a drive's operating life. Changes in head alignment, head wear, component drift, and other
factors are minimized to ensure that data integrity and interchange capability are not compromised
over the drive's operating life.
The error rate of the LTO-2 half-height drive is less than 1 hard error in 10
tectable error rate is 1 in 10
Servo band
Even # wrap
Odd # wrap
Sub bands 1 through 6
End of
(not shown)
tape (EOT)
Even # wrap
Odd # wrap
Servo band
27
bits read.
Tape edge
Sub band 0
DATA
BAND
Sub band 7
Tape edge
17
bits. The drive's unde-
Recording Method
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