Fujitsu MAN3735MC Manual/User Guide - Page 44
Sector format, Gaps G1, G2, G3
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SCT SCT G1 PLO Sync SM1 DATA1 SM2 DATA2 BCRC ECC PAD G2 SCT Servo SCT PLO G1 Sync SM1 DATA1 SM2 DATA3 PAD G2 G1 PLO Sync SM1 DATA1 SM2 DATA4 BCRC ECC PAD G3 G1 G2 G3 PLO Sync SM1 SM2 BCRC ECC PAD DATA1 DATA2 DATA3 DATA4 6 bytes 12 bytes 8 bytes 36 bytes 4 bytes 2 bytes 4 bytes 60 bytes 6 bytes 24 bytes 488 bytes n bytes (0≤n≤464, n is a multiple of 4.) (464 - n) bytes Figure 3.6 Sector format Each sector on the track consists of the following fields: (1) Gaps (G1, G2, G3) The gap length at the time of formatting (initializing) is listed in Figure 3.6. No pattern is written on the gap field. (2) PLO Sync In this field, pattern X'00' in the length in bytes listed in Figure 3.6 is written. (3) Sync Mark (SM1, SM2) In this field, special pattern in the length in bytes listed in Figure 3.6 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 even number between 512 and 528 bytes can be specified as the length. 3 - 8 C141-E128-01EN
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