Parameter Data Format

a.Parameters for specifying alternate processing areas for defective blocks (bytes 2 to 9)

The following 4 parameters specify the position and number of spare sectors for performing defective block alternate allocation processing on the disk media. See Chapter 3, "Data Format" of Product Manual for details of the HDD's alternate block processing.

Track count/zone

This parameter specifies the number of tracks a unit for alternating blocks. The INIT cannot clearly specify this value. The HDD ignores the specification for this bit. If the value of the Active Notch in Page C is 0, the "Number of Logic Heads a cell" is reported for the MODE SENSE and MODE SENSE EXTENDED commands.

If not, the total number of track of the zone which is specified as the Active Notch is reported.

Alternate sector count/zone

This parameter specifies the number of sectors per one cell as the number of spare sectors secured for use as alternate blocks. In the HDD, this parameter indicates the number of spare sectors secured in each cell. This parameter cannot be changed by the INIT.

Alternate track count/zone

This parameter specifies the area secured for alternate blocks as the number of tracks per one cell. It is impossible to change this parameter. When a value other than zero is specified in this field, the HDD performs rounding down processing of this parameter and always sets this parameter value at zero.

Alternate track count/drive

This parameter specifies the area secured for alternate blocks as the number of tracks per disk drive. In the HDD, this parameter indicates the number of tracks in the spare area secured as alternate cells. This value is fixed at a value that equals the number of tracks per cylinder multiplied by the number of zones in the HDD. This parameter cannot be changed by the INIT.

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Fujitsu MBA3073RC, MBC2036RC, MBC2073RC, MBA3300RC, MBA3147RC specifications Parameter Data Format