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CHEETAH 15K.7 SAS PRODUCT MANUAL, REV. F 43
4. Changeable values
Changeable values form a bit mask, stored in nonvolatile memory, that dictates which of the current values and saved
values can be changed by a Mode Select command. A one (1) indicates the value can be changed. A zero (0) indicates
the value is not changeable. For example, in Table 11.3.2.1, refer to Mode page 81, in the row entitled “CHG.” These are
hex numbers representing the changeable values for Mode page 81. Note in columns 5 and 6 (bytes 04 and 05), there is
00h which indicates that in bytes 04 and 05 none of the bits are changeable. Note also that bytes 06, 07, 09, 10, and 11
are not changeable, because those fields are all zeros. In byte 02, hex value FF equates to the binary pattern 11111111.
If there is a zero in any bit position in the field, it means that bit is not changeable. Since all of the bits in byte 02 are
ones, all of these bits are changeable.
The changeable values list can only be changed by downloading new firmware into the flash E-PROM.
Note. Because there are often several different versions of drive control firmware in the total population of drives in the
field, the Mode Sense values given in the following tables may not exactly match those of some drives.
The following tables list the values of the data bytes returned by the drive in response to the Mode Sense command pages
for SCSI implementation (see the SAS Interface Manual ).
Definitions:
DEF = Default value. Standard OEM drives are shipped configured this way.
CHG = Changeable bits; indicates if default value is changeable.