Fujitsu MBA3073NC Product Manual page 41

(1) Gaps (G1, G2, G3)
No pattern is written on the gap field.
(2) PLO Sync
In this field, pattern X'00' in the specified length in bytes is written.
(3) Sync Mark (SM1, SM2)
In this field, special pattern in the specified length in bytes is written. This special pattern
indicates the beginning of the data field.
(4) Data field (DATA1-DATA4)
User data is stored in the data field of the sector. The length of the data field is equal to that of the
logical data block which is specified with a parameter in the MODE SELECT command. Any
multiple of 4 between 512 and 528 bytes can be specified as the length.
(5) BCRC
It is a 4-byte error detection code. Errors in the ID field. Single burst errors with lengths of up to
32 bits for each logical block can be detected.
(6) ECC
This is the 400 bits code that allows detection and correction of errors in the data field, which is
capable of correcting the single burst error up to 200 bits max. on the fly.
(7) PAD
In this field, pattern X'00' in the specified length in bytes is written. This field includes the
variation by rotation and circuit delay till reading/writing.
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