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Revisiting the Caviar WD1000BB and the 'Cuda ATA IV


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Revisiting the Caviar WD1000BB and the 'Cuda ATA IV
  October 8, 2001 Author: Eugene Ra  


WB99/Win2k Low-Level Measurements

 Testbed II Low-Level MeasurementsDetails... 
Windows 2000 Professional using NTFS
IBM Deskstar 60GXP (60.0 GB ATA-100) - 12.3|
Maxtor DiamondMax Plus 60 (60.0 GB ATA-100) - 13.1|
Western Digital Caviar WD1000BB (100 GB ATA-100) - 13.4|
Western Digital Caviar WD1000BB-SE (100 GB ATA-100) - 13.5|
Seagate Barracuda ATA IV (80 GB ATA-100) - 13.9|
Seagate Barracuda ATA IV (80 GB ATA-100) w/ AAM On - 14.8|
Windows 2000 Professional using NTFS
Western Digital Caviar WD1000BB-SE (100 GB ATA-100) - 43800|
|
Western Digital Caviar WD1000BB (100 GB ATA-100) - 43733|
|
Seagate Barracuda ATA IV (80 GB ATA-100) - 42433|
|
Seagate Barracuda ATA IV (80 GB ATA-100) w/ AAM On - 42200|
|
IBM Deskstar 60GXP (60.0 GB ATA-100) - 39033|
|
Maxtor DiamondMax Plus 60 (60.0 GB ATA-100) - 38433|
|
Windows 2000 Professional using NTFS
Western Digital Caviar WD1000BB (100 GB ATA-100) - 27900|
|
Western Digital Caviar WD1000BB-SE (100 GB ATA-100) - 27800|
|
Seagate Barracuda ATA IV (80 GB ATA-100) - 27200|
|
Seagate Barracuda ATA IV (80 GB ATA-100) w/ AAM On - 27200|
|
Maxtor DiamondMax Plus 60 (60.0 GB ATA-100) - 22900|
|
IBM Deskstar 60GXP (60.0 GB ATA-100) - 21300|
|

Click here to examine the STR graph for the Caviar WD1000BB-SE

With AAM disabled, the Seagate Barracuda ATA IV delivers a WinBench 99 measured access time of 13.9 milliseconds, down from the 14.8 milliseconds recorded with default AAM settings. Subtracting 4.2 milliseconds to account for the rotational latency of a 7200 RPM drive yields a measured seek time of 9.7 ms- very close to Seagate's claimed 9.5 milliseconds.

As mentioned earlier, SR readers consider a 0.9 ms difference in access time to be significant. The same difference exists between Maxtor's DiamondMax Plus 60 and the category-leading IBM Deskstar 60GXP.

Western Digitial's Caviar WD1000BB-SE turns in a measured access time of 13.5 milliseconds... virtually the same as the standard WD1000BB's 13.4 ms. Subtracting 4.2 milliseconds of latency yields a measured seek time of 9.3 milliseconds, a bit off of WD's 8.9 ms claim.

In theory, changes in access times and/or buffer sizes should yield no significant differences in measured transfer rates. And as expected, the 'Cuda IV with AAM disabled (after all, it's the same physical drive) yields no changes. Ditto for the WD1000BB-SE.

How do these changes translate into Disk WinMark 99 performance?

 WinMarks...


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