9.5Synchronous data transfer

The data transfer period to be used by the drive and the initiator is established by an exchange of messages during the Message Phase of operation. See the section on message protocol in the SCSI Interface Product Manual, part number 75789509.

9.5.1Synchronous data transfer periods supported

In the following tables, M is the synchronous period value (in the transfer rate negotiation message) that repre- sents the associated transfer period and transfer rate values.

Table 11 lists the synchronous data transfer periods supported by the drive in DT DATA phase. DT DATA phase is only allowed when using the LVD interface.

Table 11: Synchronous DT DATA transfer periods

 

Transfer period

Transfer rate

Transfer rate

M (decimal)

(nanoseconds)

(megatransfers/second)

(Mbytes/second) on wide bus

 

 

 

 

8

6.25

160.0

320.0

 

 

 

 

9

12.5

80.0

160.0

 

 

 

 

10

25

40.0

80.0

 

 

 

 

12

50

20.0

40.0

 

 

 

 

25

100

10.0

20.0

 

 

 

 

Table 12 lists the synchronous data transfer periods supported by the drive in ST DATA phase. ST DATA phase is allowed with either LVD or SE interface except as noted.

Table 12: Synchronous ST DATA transfer periods

 

Transfer period

Transfer rate

M (decimal)

(nanoseconds)

(megatransfers/second)

 

 

 

10

25

40.01

12

50

20.0

 

 

 

25

100

10.0

 

 

 

50

200

5.0

 

 

 

1.This transfer rate is only allowed when using the LVD interface.

9.5.2REQ/ACK offset

Cheetah 10K.7 SCSI family drives support REQ/ACK offset values from 7 to 63 (3Fh). Offsets of 1 through 6 are negotiated to 0 (asynchronous transfer).

9.6Physical interface

This section describes the connectors, cables, signals, terminators and bus timing of the DC and SCSI I/O interface. See Section 9.8 and Section 9.9 for additional terminator information.

Figures 22 and 23 show the locations of the DC power connector, SCSI interface connector, drive select head- ers, and option select headers.

Details of the physical, electrical and logical characteristics are given in sections following, while the SCSI operational aspects of Seagate drive interfaces are given in the SCSI Interface Product Manual.

64

Cheetah 10K.7 SCSI Product Manual, Rev. D

Page 74
Image 74
Seagate ST373207LW/LC manual Physical interface, Synchronous data transfer periods supported, 2 REQ/ACK offset

ST3300007LW/LC, ST373207LW/LC, ST3146707LW/LC specifications

Seagate's ST3146707LW/LC, ST373207LW/LC, and ST3300007LW/LC are part of the company's renowned line of hard disk drives (HDDs), specifically designed for enterprise and high-performance computing environments. With their reliability and performance, these drives have become popular choices for data centers and critical applications requiring extensive storage capabilities.

One of the standout features of these models is their capacity to handle large volumes of data. The ST3146707LW/LC has a capacity of 146GB, while the ST373207LW/LC offers 73GB, and the ST3300007LW/LC comes with a substantial 300GB. These capacities make them well-suited for applications that require not only high storage space but also rapid access to data.

In terms of performance, these drives utilize a 10,000 RPM spindle speed, which significantly enhances data access times and overall performance. The combination of fast rotational speeds with Seagate's advanced caching algorithms allows for swift data retrieval, making these drives ideal for environments where speed is crucial.

These HDDs also employ the SCSI (Small Computer System Interface) interface, which promises high data transfer rates and reliability in enterprise-level applications. The Ultra320 SCSI interface can support transfer rates up to 320 MB/s, ensuring that the drives can efficiently communicate with other system components.

Another key technology featured in these models is Seagate's Adaptive Error Correction technology, which enhances data integrity and reliability. This feature helps in the detection and correction of errors that can occur during data transfer, reducing the risk of data loss.

Performance consistency is critical in enterprise environments, and these drives are built to endure the demands of 24/7 operation. They are designed with robust mechanisms to withstand temperature fluctuations, shock, and vibrations commonly found in data center settings.

In summary, the Seagate ST3146707LW/LC, ST373207LW/LC, and ST3300007LW/LC hard drives exemplify advanced features and technologies tailored for enterprise storage solutions. With significant capacities, impressive spindle speeds, SCSI connectivity, and reliability-focused technologies, these drives remain a valuable asset for businesses relying on stable and high-performance data storage.