Sony Storage Support

Storage Support USA

What is the tape capacity of the Sony DDS tape drives?

Answer:

Tape capacity will vary depending on the length of the tape and whether hardware compression is enabled.

Native Tape Capacity  Typical Capacity w/ Compression*
        SDT-7000:  60m 1.3 GB              2.6 GB
                   90m 2.0 GB              4.0 GB
                  120m 4.0 GB              8.0 GB
        SDT-9000:  60m 1.3 GB              2.6 GB
                   90m 2.0 GB              4.0 GB
                  120m 4.0 GB              8.0 GB
                  125m 12.0 GB            24.0 GB
        SDT-10000: 60m 1.3 GB              2.6 GB
                   90m 2.0 GB              4.0 GB
                  120m 4.0 GB              8.0 GB
                  125m 12.0 GB            24.0 GB
                  150m 20.0GB             40.0 GB

When data compression is enabled, drive capacity can increase typically twice. The efficiency of the data compression depends on the actual data that is being compressed, and cannot be predicted precisely prior to compression. The more random the data is, the less compression is possible. This is due to the fact that data compression operates on the principle of reducing the redundancy in the data string, and random data has very little redundancy.

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