Richard,

www.techadvice.com lists the following specs for this drive:

WDAC31200 - Caviar »

IDE
1203.2mb
2484 Cylinders
16 heads
63 Sectors
2484 Write Pre-compensation
2484 Landing Zone
DMA and Block Mode Support
11.1 MB/s Mode 3 PIO
13.3 MB/s Mode 1 DMA
Logical Block Addressing
64KB CacheFlow3 Buffer
10 ms Access Time
250,000 Power On Hours MTBF
ISA, VESA VL or PCI Local Bus
4500 RPM
2503872 Total Sectors
Part Number: AC3120000F

As you can see it has a 64K cache.

Hope this help,
Dave Souza

-----Original Message-----
<snip>


Hi
PC-BUILD

I have a Western Digital Caviar AC31200 hard drive with which I am very
satisfied, but want to know if and how large is the on-board cache?
The test results with Wintune test program seem to indicate a cache.
I have been unable to find this info at Western Digital's website.
Please don't just send me to another website to look for non-existent
information.

Thanks for your valuable time,

Richard Dennis Smith