System and method for reading unidirectionally recorded data bidirectionally
AssigneeStorage Technology Corporation
InventorsKeith G. Boyer, Richard A. Gill, Thomas H. Gohl
Life of this patent
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Abstract
A system and method for allowing uni-directional data to be read in the reverse direction as well as the forward direction uses a data buffer to reverse the order of data read from storage media. Data are read from the storage media in the reverse direction and stored in a data buffer. Pointers are set up to track record boundaries of the data storedin the data buffer. The data are read from the data buffer in the opposite direction from which they are stored and sent to a host in the forward direction. Cyclic redundancy checks can be performed as data are read from the storage media in the reverse direction and read from the data buffer in the forward direction.
Claims17
A method for retrieving uni-directional encrypted data, comprising the steps of:
- reading the encrypted data from a storage media in an opposite direction from which it was written;
- storing the encrypted data read from the media in a data buffer in the order in which the data was read;
- and
- decrypting the stored data from the data buffer in an opposite direction from which it was stored.
A data storage and retrieval system for retrieving uni-directional encrypted data, comprising:
- tape drive means for reading encrypted data from a storage media in an opposite direction from which it was written;
- first buffer means for storing the encrypted data read from the media in the order in which the data was read;
- and
- second buffer means for decrypting the stored data in an opposite direction from which it was stored.
Dependencies are inferred from the claim text.