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3.1 Data Space
C141-E234 3-7
Each sector on the track consists of the following fields:
(1) Gaps (G1, G2, G3)
No pattern is written on the gap field.
(2) PLO Sync
In this field, pattern X'00' is written.
(3) Sync Mark (SM1, SM2)
In this field, special pattern 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 54-byte code that allows detection and correction of errors in the data field, which is
capable of correcting the single burst error up to 216 bits max. on the fly.
(7) PAD
A specified length of x‘00’ pattern is written in this field. This field includes the variation by rotation
and circuit delay till reading/writing.