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6.
Erased Areas on the Tape - The more erased areas a tape contains, the less
data it can hold.
6.6.1
Data Capacity Tables
The following tables, showing the data capacities in megabytes for various length
tapes, assume a constant block length, no filemarks, and standard gap lengths.
While all 34XX tape drives are capable of reading or writing data blocks of any length, not all
computers are equally capable. A maximum data block size of 32768 bytes is generally
acceptable, but some computers have maximum limits as low as 2048 bytes (the maximum size
specified by ANSI).
Length (ft):
Density
1600 CPI
3200 CPI
6250 CPI
Table 6-1 Unformatted Tape Capacities
Length (ft):
Block Size
80
128
256
512
1024
2048
4096
8192
16384
32768
Table 6-2 Formatted Tape Capacities, 1600 CPI
Length (ft):
Block Size
80
128
256
512
500300 Rev. U
NOTE
300
600
1200
MEGABYTES
5.8
11,5
23.1
11.5
23.0
46.1
22.5
45.0
90.0
300
600
1200
MEGABYTES
0.4
0.8
1.6
0.6
1.2
2.4
1.1
2.2
4.4
1.8
3.7
7.4
2.8
5.6
11.2
3.8
7.5
15.1
4.6
9.1
18.3
5.1
10.2
20.4
5.4
10.8
21.6
5.6
11.2
22.3
300
600
1200
MEGABYTES
0.4
0.9
1.7
0.7
1.3
2.7
1.2
2.5
5.1
2.3
4.6
9.2
Preventative Maintenance
2400
3600
46.1
69.2
92.2
138.4
180.0
270.0
2400
3600
3.2
4.8
4.9
7.4
8.9
13.3
14.9
22.3
22.5
33.7
30.2
45.3
36.5
54.9
40.7
61.1
43.2
64.8
44.6
66.9
2400
3600
3.4
5.1
5.4
8.1
10.2
15.2
18.3
27.4
6-7
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