The FORMAT UNIT Defect List Header (Table
Table
Bit | 7 | 6 | 5 | 4 |
| 3 | 2 | 1 | 0 |
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0 |
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| Reserved |
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1 | FOV | DPRY | DCRT | STPF |
| IP | DSP | Immed | VS |
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| Defect List | Length |
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| Table | ||
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Name |
| Description | |
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FOV |
| The Format Options Valid bit indicates that the remaining option bits in this byte are valid. | |
| If this bit is not set, the remaining bits, except Immed, are ignored. | ||
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DPRY |
| The Disable Primary bit specifies whether the drive should ignore the Primary Defect List | |
| during the format to identify defective areas on the media. The drive's default is 0, indicating | ||
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| that the drive should replace sectors found in the Primary Defect List during the format. | |
DCRT |
| The Disable Certification bit specifies whether the drive should certify the media during the | |
| format. The drive’s default is 0, indicating that the drive should certify the media. | ||
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| The Stop Format bit specifies the error conditions under which the drive is to terminate the | |
STPF |
| format. The state of the bit is ignored and the drive acts as if this bit is set. If either the Grown | |
| Defect List or the Primary Defect List is not found, the format operation terminates with a | ||
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| CHECK CONDITION status and a sense key of MEDIUM ERROR | |
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| The Initialization Pattern bit signals the drive that the FORMAT UNIT Parameter List con- | |
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| tains initialization pattern information. | |
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| An Initialization Pattern bit of 1 indicates that an initialization pattern descriptor (Table 5- | |
IP |
| 17) is included in the FORMAT UNIT parameter list immediately following the Defect List | |
| Header. | ||
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| An Initialization Pattern bit of 0 indicates that an initialization pattern descriptor (Table 5- | |
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| 17) is not included in the FORMAT UNIT parameter list, and the drive will use its default | |
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| initialization pattern of all zeros. | |
DSP |
| The Disable Saving Parameter prohibits the drive from preserving MODE SELECT param- | |
| eters received while the Format is in progress. This bit is ignored, and the drive acts as if it | ||
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| were set. | |
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| When the Immediate bit is 0, the drive returns a status after the format operation completes. | |
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| If the disconnect privilege is granted in the accompanying IDENTIFY message, the drive dis- | |
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| connects from the bus after fetching and validating the Command Descriptor Block and the | |
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| FORMAT UNIT Parameter List. If the disconnect privilege is not granted, the drive stays | |
Immed |
| connected to the bus during the entire FORMAT UNIT command. When the Immediate bit | |
| is set to 1, the drive returns a status after the Command Descriptor Block and FORMAT | ||
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| UNIT Parameter List have been fetched and validated. In this case, the drive ignores the | |
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| IDENTIFY message's disconnect privilege bit and remains connected to the bus while it val- | |
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| idates the Command Descriptor Block and Parameter List. It returns the completion status | |
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| before it disconnects. The drive then proceeds with the format. | |
VS |
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| Gives the length in bytes of the Defect Descriptors that follow. A value of 0 is valid and | |
Defect List Length | means that no Defect Descriptors follow. A CHECK CONDITION status is returned if this | ||
value is not a multiple of the defect descriptor size. The Defect List Length is equal to four | |||
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| times the number of defect descriptors if Block format is used, or eight times if Bytes From | |
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| Index format or Physical Sector format is used. |