9.10Disc drive SCSI timing

Table 21: Disc drive SCSI timing

These values are not current Cheetah 10K.7 SCSI values, but are listed for information only.

 

Waveform

Waveform

 

 

Description

symbol [1]

table [1]

Typical timing

 

 

 

 

Target Select Time (no Arbitration)

T00

N/A

<1 ∝s

 

 

 

 

 

Target Select Time (with Arbitration)

T01

4.5-1,2

1.93

∝s

 

 

 

 

 

Target Select to Command

T02

4.5-1

3.77

∝s

 

 

 

 

 

Target Select to MSG Out

T03

4.5-2

1.57

∝s

 

 

 

 

 

Identify MSG to Command

T04

4.5-3

3.36

∝s

 

 

 

 

Command to Status

T05

4.5-5

Command Dependent

 

 

 

 

Command to Data (para. In)

T06

4.5-9

Command Dependent

 

 

 

 

Command to Data (para. Out)

T07

4.5-10

Command Dependent

 

 

 

 

Command to Data (Write to Data Buffer)

T08

4.5-10

Command Dependent

 

 

 

 

Command to Disconnect MSG

T09

4.5-6

Command Dependent

 

 

 

 

 

Disconnect MSG to Bus Free

T10

4.5-6,14

0.52

∝s

 

 

 

 

Disconnect to Arbitration (for Reselect)

T11

4.5-6

Command Dependent

This measures disconnected CMD overhead

 

 

 

 

 

 

 

 

 

Target win Arbitration (for Reselect)

T12

4.5-7

3.00

∝s

 

 

 

 

 

Arbitration to Reselect

T13

4.5-7

1.60

∝s

 

 

 

 

 

Reselect to Identify MSG In

T14

4.5-7

1.39

∝s

 

 

 

 

Reselect Identify MSG to Status

T15

4.5-8

Command Dependent

 

 

 

 

Reselect Identify MSG to Data (media)

T16

4.5-11

Command Dependent

 

 

 

 

Data to Status

T17

4.5-15

Command Dependent

 

 

 

 

 

Status to Command Complete MSG

T18

4.5-5,8,15

0.98

∝s

 

 

 

 

 

Command Complete MSG to Bus Free

T19

4.5-5,8,15

0.51

∝s

 

 

 

 

 

Data to Save Data Pointer MSG

T20

4.5-14

4.00

∝s

 

 

 

 

 

Save Data Pointer MSG to Disconnect MSG

T21

4.5-14

0.79

∝s

 

 

 

 

 

Command Byte Transfer

T22

4.5-4

0.04

∝s

 

 

 

 

 

Next Command Byte Access:

 

4.5-4

 

 

 

 

 

 

 

Next CDB Byte Access (Byte 2 of 6)

T23.6.2

4.5-4

0.58

∝s

 

 

 

 

 

Next CDB Byte Access (Byte 3 of 6)

T23.6.3

4.5-4

0.12

∝s

 

 

 

 

 

Next CDB Byte Access (Byte 4 of 6)

T23.6.4

4.5-4

0.12

∝s

 

 

 

 

 

Next CDB Byte Access (Byte 5 of 6)

T23.6.5

4.5-4

0.12

∝s

 

 

 

 

 

Next CDB Byte Access (Byte 6 of 6)

T23.6.6

4.5-4

0.12

∝s

 

 

 

 

 

Next CDB Byte Access (Byte 2 of 10)

T23.10.2

4.5-4

0.59

∝s

 

 

 

 

Next CDB Byte Access (Byte 3 of 10)

T23.10.3

4.5-4

0.11 ∝s ±1 ∝s

 

 

 

 

 

Next CDB Byte Access (Byte 4 of 10)

T23.10.4

4.5-4

0.12

∝s ±1 ∝s

 

 

 

 

Next CDB Byte Access (Byte 5 of 10)

T23.10.5

4.5-4

0.11 ∝s ±1 ∝s

 

 

 

 

Next CDB Byte Access (Byte 6 of 10)

T23.10.6

4.5-4

0.11 ∝s ±1 ∝s

 

 

 

 

 

Next CDB Byte Access (Byte 7 of 10)

T23.10.7

4.5-4

0.13

∝s ±1 ∝s

 

 

 

 

 

84

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

Page 93 Page 95
Page 94
Image 94
Seagate ST3300007LW/LC, ST3146707LW/LC, ST373207LW/LC manual Disc drive Scsi timing
Page 93 Page 95

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.

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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.
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