58 Barracuda 18XL Product Manual, Rev. A
9.3.2.1 Notes for tables 9a through 9f
[1] Though byte 12, bit 7 (A0) is shown as changeable, the FSW function governed by that bit is not imple-
mented by this drive.
[2] Page 0, Byte 2, Bit 7 is defined as the Performance Mode (PM) bit. When set to zero (Server mode), the
SCSI firmware is performance optimized for server applications. When the bit is set to one (Desktop
mode), the SCSI firmware is performance optimized for desktop applications. The firmware default condi-
tion for the PM bit is set to one for Desktop mode. During the manufacturing process, the Saved value of
the PM bit remains set to the firmware default condition (one) for drives with the LW and LWV interface.
Drives manufactured with all other interfaces (N, W, LC, LCV) save the Saved value of the PM bit set to
the Server mode (zero).
[3] When the Performance Mode bit (Page 0, Byte 2, Bit 7) is set to Server mode (zero), the Number of
Cache Segments should be set to three. When the Performance Mode bit is set to Desktop mode (one),
the Number of Cache Segments should be set to sixteen (10h).
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