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 val- ues 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 storage 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 values after a power on reset, hard reset, or Bus Device Reset message.

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 9, 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 com- mand pages for SCSI implementation (see the SAS Interface Manual).

DEF = Default value. Standard OEM drives are shipped configured this way.

CHG = Changeable bits; indicates if default value is changeable.

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Seagate ST9300403SS, ST9300603SS, ST9300503SS, ST9146803SS, ST9146703SS, ST9146603SS manual
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ST9146803SS, ST9300603SS, ST9300503SS, ST9146603SS, ST9146703SS specifications

Seagate has long been a key player in the storage technology industry, and its enterprise-class hard drives such as the ST9300503SS, ST9300403SS, ST9146603SS, ST9146803SS, and ST9146703SS stand out for their performance, reliability, and innovative features. Designed primarily for use in data centers and server environments, these drives offer a range of specifications suited for high-demand applications.

The Seagate ST9300503SS is a 300GB 2.5-inch SAS (Serial Attached SCSI) hard drive that operates at 10,000 RPM, which is essential for ensuring rapid data access. It provides a data transfer rate of 6 Gb/s and features Seagate's AgileArray technology, which enhances RAID performance and reliability by improving data integrity and optimizing power consumption. The drive is also designed to withstand the rigors of enterprise use, boasting a mean time between failures (MTBF) rating of 1.6 million hours.

In contrast, the ST9300403SS offers a similar 300GB capacity and speed, but with slight variations in features that make it better suited for specific applications. This drive also supports SAS 2.0 and includes features that enhance error recovery and data protection.

The ST9146603SS is another powerhouse, providing 146GB of storage. Operating at the same high spindle speed of 10,000 RPM, it is optimized for low-latency performance. This makes it highly suitable for transactional applications and environments where quick access to data is crucial. Like its counterparts, this drive is built with robust technologies that ensure reliable operation and enhanced data security.

The ST9146803SS bumps up the storage capacity to 300GB while maintaining the same impressive speed and performance features. Its incorporation of Seagate’s SeaTach technology allows for advanced communication protocols, which facilitate faster data transfers and lower latency.

Finally, the ST9146703SS also offers 146GB of storage and is known for its energy efficiency features that reduce operational costs in large-scale deployments. All these drives support a wide range of operating systems, making them versatile picks for businesses looking to upgrade their storage solutions.

Overall, the Seagate ST9300503SS, ST9300403SS, ST9146603SS, ST9146803SS, and ST9146703SS are essential components in any enterprise environment, delivering high performance, reliability, and advanced technology features that meet the critical demands of modern data storage.
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