| 摘要 |
A method selectively compresses data entering a data storage device, such as a digital linear tape drive, based upon whether a data level of a device cache buffer is above a predetermined watermark reference level. If the data level is above the predetermined reference, a data record entering the storage device bypasses a data compressor on its way to storage. After each record is transferred the buffer level is redetermined. When the buffer level falls below the watermark, the data compressor is reenabled and a subsequent data record is compressed before being stored.
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