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Additional ECC for Data DAT Disclosure Number: IPCOM000099143D
Original Publication Date: 1990-Jan-01
Included in the Prior Art Database: 2005-Mar-14
Document File: 2 page(s) / 48K

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Ohgaki, K: AUTHOR [+2]


Disclosed is a technique to improve hard error of DAT (Digital Audio Tape) when it is used in data

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This is the abbreviated version, containing approximately 87% of the total text.

Additional ECC for Data DAT

       Disclosed is a technique to improve hard error of DAT
(Digital Audio Tape) when it is used in data

      The DAT has basically the function of error correction each
track, but it has no effect on a burst error longer 792 bytes.  An
additional ECC (Error Correction Code) correct such a burst error.
The capability of the ECC will be decided by selecting a commercial
ECC and setting the parameter of the module based upon size of an
acceptable buffer register and the of the data transfer rate at the
tape device.  The explanation is for a sample having:
   a buffer register size    36,480 bytes, and
   a data rate              161.7 kbytes/second
                            (basic 192.0).

      Figs. 1-3 show buffer register shapes on write  Fig. 1 shows
that the transferred data from the is divided into 256 bytes and ECC
48 bytes are added. the basic data rate of 192 will be degraded as
192 x kbytes/second.

      Fig. 2 shows that Fig. 1 was rotated 90 degrees  Fig.  3 shows
that Fig. 2 was divided into 13 x bytes, which is the data length of
1 track in DAT.  In case, 2880 bytes are composed of 120 bytes (of
Fig. 1) 24 bytes (correctable burst error length of the additional

      The write operation is executed from the first 2880 by
sequential bit handling of 13 tracks as 1 block.

      Therefore, even if all data (2880 bytes, which is longer 792
bytes) in one...