Attention: Cartridges written in QIC-4GB format or QIC-2GB compressed format
cannot be read on the 7207 13GB Quarter-Inch Tape Drive Model 315. The
QIC-2GB uncompressed format (density setting 34) is the recommended format for
interchange with the 7207-315 Tape Drive.
Figure 12. Density Settings for QIC Data Cartridge Recording Formats
QIC Format
Density
Setting
Cartridge Capacity
(see Note)
QIC-4GB-DC (compressed)
166
8GB
(with 2:1 compression)
QIC-4GB-DC
38
4GB
QIC-2GB-DC (compressed)
162
5GB
(with 2:1 compression)
QIC-2GB-DC
34
2.5GB
QIC-1000-DC
21
1.2GB
QIC-525-DC
17
525MB
QIC-150-DC
16
250MB
QIC-120-DC
15
125MB
Notes:
1. Capacity varies, depending on the specific cartridge that you select.
2. 1MB
=
one megabyte or 1 000 000 bytes.
Technical Notes about Using SMIT
Handling Compression
You cannot turn compression on and off in SMIT. The default setting is off, with no
option to turn it on. However, you can make compression available for the
QIC-4GB-DC and QIC-2GB-DC formats by selecting the proper density options.
Density 166 is the default density, and is the QIC-4GB-DC format operating with
data compression on. With 2:1 compression, the cartridge capacity is 8GB and the
data rate is 760 000 bits per second. If you select density 38, the QIC-4GB-DC
format writes in uncompressed mode.
Compression is handled in a similar fashion for the QIC-2GB-DC format. If you
select density 162, the format writes with compression on. If you select density 34,
the format writes with compression off.
Restrictions on Block Size
SMIT allows you to select block size. Only certain block size selections are valid for
the 7207-122 Tape Drive. Valid block sizes depend on the format written, which
you control by the density setting. Figure 13 defines the block size restrictions.
22
7207 Tape Drive Setup, Operator, and Service Guide
Summary of Contents for System Storage 7207
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