Device Area; Reference Area; Figure 26. Layout Of A Single Data Space Tape - Seagate STD124000N Product Manual

Chapter 6
Pos. Tol.
Device Reference
Band
Area Area
No. 1
Device Reference
PBOT LBOT
350 mm
35
±10 mm
frames

Figure 26. Layout of a Single Data Space Tape

Page 54
System System System
Preamble Log
30
25
frames
frames

Device Area

The device area is the first area recorded on the tape and extends from the physical
beginning of tape (PBOT) to the logical beginning of tape (LBOT). The device area
is not used for writing data for interchange. The device area consists of three zones,
the spinup zone , the test zone and the guard zone .
The spinup zone consists of the first part of the tape that is wrapped around the
cylinder when the tape is inserted into the drive. The next zone, the test zone, is
available for read/write purposes. The last zone, the guard zone, is specified as
having a minimum length of 9 mm in which no recording is permitted.

Reference Area

The Reference Area is used as the physical reference when updating the system log
and consists of 35 tape management frames starting at the LBOT and having an
absolute frame number of 1.
Pos. Tol.
Vendor
Band Group
Postamble
No. 2
Preamble
System
10
frames
Last
Amble
Recorded
Data Group
Data
Recorded Recorded
Vendor
Data Group Data Group
Group
No. 1
Data
EOD Post-EOD
Area
Frames
EOD
Minimum
Minimum
12 frames
450 frames
Tape Formats
No. 2
Area
Post-EOD
PEOT
DAT Drives