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CHEETAH 15K.7 SAS PRODUCT MANUAL, REV. F 42
11.3.1 Inquiry data
Table lists the Inquiry command data that the drive should return to the initiator per the format given in the SAS Interface
Manual.
* Copyright year (changes with actual year).
** SCSI Revision support. Refer to the appropiate SPC release documentation for definitions.
PP 10 = Inquiry data for an Inquiry command received on Port A.
30 = Inquiry data for an Inquiry command received on Port B.
R# Four ASCII digits representing the last four digits of the product firmware release number.
S# Eight ASCII digits representing the eight digits of the product serial number.
[ ] Bytes 18 through 26 reflect model of drive. The table above shows the hex values for Model ST3600057SS.
11.3.2 Mode Sense data
The Mode Sense command provides a way for the drive to report its operating parameters to the initiator. The drive
maintains four sets of mode parameters:
1. Default values
Default values are hard-coded in the drive firmware stored in flash E-PROM (nonvolatile memory) on the drive’s PCB.
These default values can be changed only by downloading a complete set of new firmware into the flash E-PROM. An
initiator can request and receive from the drive a list of default values and use those in a Mode Select command to set up
new current and saved values, where the values are changeable.
2. Saved values
Saved values are stored on the drive’s media using a Mode Select command. Only parameter values that are allowed to
be changed can be changed by this method. Parameters in the saved values list that are not changeable by the Mode
Select command get their values from default values storage.
When power is applied to the drive, it takes saved values from the media and stores them as current values in volatile
memory. It is not possible to change the current values (or the saved values) with a Mode Select command before the
drive achieves operating speed and is “ready.” An attempt to do so results in a “Check Condition” status.
On drives requiring unique saved values, the required unique saved values are stored into the saved values storage
location on the media prior to shipping the drive. Some drives may have unique firmware with unique default values also.
On standard OEM drives, the saved values are taken from the default values list and stored into the saved values stor-
age location on the media prior to shipping.
3. Current values
Current values are volatile values being used by the drive to control its operation. A Mode Select command can be used
to change the values identified as changeable values. Originally, current values are installed from saved or default val-
ues after a power on reset, hard reset, or Bus Device Reset message.
Table 10 Cheetah 15K.7 inquiry data
BYTES DATA (HEX)
0-15 00 00 xx** 12 8B 00 PP 02 53 45 41 47 41 54 45 20 Vendor ID
16-31 [53 54 33 36 30 30 30 35 37 53 53]
1
20 20 20 20 20 Product ID
32-47 R# R# R# R# S# S# S# S# S# S# S# S# 00 00 00 00
48-63 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
64-79 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
80-95 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
96-111 00 43 6F 70 79 72 69 67 68 74 20 28 63 29 20 32* *Copyright
112-127 30* 30* 39* 20 53 65 61 67 61 74 65 20 41 6C 6C 20 notice
128-143 72 69 67 68 74 73 20 72 65 73 65 72 76 65 64 20