![background image](http://html1.mh-extra.com/html/ibm/system-storage-7207/system-storage-7207_setup-operator-and-service-manual_4066817034.webp)
Figure 13. Block Size Restrictions for the 7207-122 Tape Drive
Format
Allowed Block Sizes (in bytes)
(see Notes)
0
512
1024
QIC-4GB-DC
Yes
Yes
Yes
QIC-2GB-DC
Yes
Yes
Yes
QIC-1000-DC
Yes
Yes
Yes
QIC-525-DC
Yes
Yes
Yes
QIC-150-DC
Yes
Yes
No
QIC-120-DC
Yes
Yes
No
Notes:
1. To select the variable block mode, set the block size to 0 (the maximum allowable
variable block size is 32 768 bytes).
2. Use of block sizes other than those described above will not cause an error while
using SMIT, but will result in an error when you attempt to write with the 7207-122
Tape Drive.
3. If you attempt a read operation with a block size other than the one written on the
tape cartridge, an illegal length error may result.
Tape Cartridge Efficiency
Tape cartridge efficiency refers to the amount of data that can be stored on a tape
cartridge and the rate at which the data can be read from the tape. The following
variables affect the amount of data that can be stored on a SLR5-4GB quarter-inch
tape cartridge:
Mode of operation (streaming or nonstreaming)
Size of the data file
Number of file marks (empty physical blocks on a tape) per file
Variable postambles and preambles (separators between physical blocks on a
tape)
Type of format (QIC-4GB-DC, QIC-2GB-DC, QIC-1000-DC, QIC-525-DC,
QIC-150-DC, or QIC-120-DC)
Compressibility of data (if running with compression on)
Chapter 4. Using the Media
23
Summary of Contents for System Storage 7207
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