October 2001
Beginner
1024 pages
25h 8m
English
Content preview from FreeBSD® Unleashed
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SCSI Disks
If all this IDE nonsense is something you can afford to bypass, or if you will be attaching external disks to your system, your alternative is SCSI. At first glance, the litany of SCSI modes (shown in Table 19.4) looks hardly any less bizarre than that of IDE.
| Standard | Transfer Mode | Transfer Speed | Max Cable Length | Devices/ Ids | Connector |
|---|---|---|---|---|---|
| SCSI-1 | SCSI | 5MB/s | 6m | 8 | 50-pin |
| SCSI-2 | Fast SCSI | 10MB/s | 3m | 8 | 50-pin |
| Wide SCSI | 10MB/s | 6m | 16 | 68-pin | |
| Fast Wide SCSI | 20MB/s | 3m | 16 | 68-pin | |
| SCSI-3 | Ultra SCSI | 20MB/s | 1.5m–3m | 4–8 | 50-pin |
| Wide Ultra SCSI | 40MB/s | 1.5m–3m | 4–16 | 68-pin | |
| Ultra2 SCSI | 40MB/s | 12m | 8 | 50-pin | |
| Wide Ultra2 SCSI | 80MB/s | 12m | 16 | 68-pin | |
| Ultra3 SCSI | 160MB/s | 12m | 16 | 68-pin | |
| Ultra160 SCSI | 160MB/s | 12m | 16 | 68-pin | |
| Ultra320 ... |
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