8 | Barracuda 36ES2 Product Manual, Rev. B |
4.0Performance characteristics
4.1Internal drive characteristics (transparent to user)
| ST336938/ | ST318438/ |
|
| ST336918 | ST318418 |
|
Drive capacity | 36.954 | 19.924 | Gbytes (formatted, rounded off) |
Read/write heads | 2 | 2 |
|
Bytes/track | 401 | 401 | KBytes (average, rounded off) |
Bytes/surface | 18.477 | 18.477 | Mbytes (unformatted, rounded off) |
Tracks/surface (total) | 56,332 | 26,000 | Tracks (user accessible) |
Tracks/inch | 58,480 | 58,480 | TPI |
Peak bits/inch | 480 | 480 | KBPI |
Internal data rate | Mbits/sec (variable with zone) | ||
Disc rotational speed | 7,200 | 7,200 | r/min (+0.5%) |
Average rotational latency | 4.17 | 4.17 | msec |
4.2SCSI performance characteristics (visible to user)
The values given in Section 4.2.1 apply to all models of the Barracuda 36ES2 family unless otherwise speci- fied. Refer to Section 9.10 and to the SCSI Interface Product Manual, part number 75789509, for additional timing details.
4.2.1Access time [5]
| Including controller overhead | Not including controller overhead | ||
| (without disconnect) [1] [3] | (without disconnect) [1] [3] | ||
| Drive level | Drive level |
| |
| Read | Write | Read | Write |
36 Gbyte Model |
| msec | msec |
|
8.7 | 9.5 | 8.5 | 9.3 | |
Single | 0.8 | 1.2 | 0.6 | 1.0 |
Full | 15.1 | 15.8 | 14.9 | 15.6 |
18 Gbyte Model |
|
|
|
|
7.1 | 7.7 | 6.9 | 7.5 | |
Single | 0.8 | 1.2 | 0.6 | 1.0 |
Full | 10.2 | 10.9 | 10.0 | 10.7 |
4.2.2Format command execution time (minutes) [1]
| ST336938, ST336918 |
| ST318438, ST318418 |
Maximum (with verify) | 46 |
Maximum (no verify) | 23 |
4.2.3Generalized performance characteristics
Minimum sector interleave | 1 to 1 |
Data buffer transfer rate to/from disc media (one
Minimum [3]* | 32.3 Mbytes/sec |
Average [3] | 45.9 Mbytes/sec |
Maximum [3] | 52.2 Mbytes/sec |
