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4.2
Unformatted and formatted capacities
Formatted capacity depends on the number of spare reallocation sectors reserved and the number of bytes per
sector. The following table shows some typical formatted capacities.
Spare Sectors or Cylinders
Reserved for reallocation
No Spares
12 Spare Sectors Per Cylinder [2]
2 Spare Cylinders per Unit [3]
One Spare Sector per Cylinder
2 Spare Cyl. per Unit [3]
Unformatted Capacity
Notes.
[1] Bytes per sector. Sector size selectable at format time. Users having the necessary equipment may modify
the data block size before issuing a format command and obtain different formatted capacities than those
listed. User available capacity depends on spare reallocation scheme selected. See Mode Select Command
and Format Command in the SCSI Interface Product Manual P/N 77738479.
[2] Twelve spare sectors are on one track. ST11900 has 6 spare sectors per cylinder.
[3] Spare cylinders are on the inner tracks.
The standard OEM model is as follows:
ST12400N/ND/NC
ST11900N/ND/NC
*Twelve spare sectors per cylinder, two spare cylinders/unit for ST12400
Six spare sectors per cylinder, two spare cylinders/unit for ST11900
4.3
Options (factory installed)
The capacities shown in paragraph 4.2 are available upon request. Other capacities can be ordered depending
on sparing scheme and sector size requested.
The following options are incorporated at the time of production. See Section 12.0.
•
Front panel (green LED) - See Figure 3.0-1
•
Installation Manual P/N 77767451
4.4
Optional accessories (user installed)
The following accessories are available. All kits may be installed in the field. See Section 13.0.
•
Front Panel Kit (with green LED) - See Figure 3.0-1
•
Single Unit shipping pack kit
•
Installation Guide P/N 77767451
•
Adapter Accessory Frame Kit P/N 75790701 (adapts 3.5-inch drive to fit in 5.25-inch drive mounting
space)
Product Manual - Hawk 2 Family SCSI-2 (Volume 1), Rev. C
ST12400N/ND/NC
512[1]
2165
2148
2162
Formatted Data Block Size*
512 Byte/Sector
2148 MB
1700 MB
1024[1]
MB
2279
2245
2275
2537
Unformatted
2537 MB
2003 MB
ST11900N/ND/NC
512[1]
1024[1]
MB
1709
1799
1700
1758
1707
1795
2003
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