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Hale, I have always thought that the reason to turn read look ahead off was to increase read cache performance. If there is an application that frequently re-reads recently read data then you want the largest possible read cache. By turning read look ahead off the drive can devote more cache to keeping previously read data instead of using the buffer to store read ahead data. Best Regards, Daniel J. Colegrove Hitachi Global Storage Technologies [EMAIL PROTECTED] (702) 614-6119 Hale Landis <[EMAIL PROTECTED]> Sent by: [EMAIL PROTECTED] 06/29/2005 09:31 AM Please respond to Hale Landis <[EMAIL PROTECTED]> To [email protected] cc Subject Re: [t13] Read Look Ahead This message is from the T13 list server. Curtis Stevens wrote: > This message is from the T13 list server. > Hale > I have to disagree with you. I do not have any recollection of read > ahead controlling read cache. To the best of my knowledge, this disables > look ahead in WD drives but has no effect on read cache. Quite frankly I > was shocked to hear that someone was actually interpreting the function as a > cache disable. No ATA rev has even hinted that this was a cache disable... So both you and Mark are saying there is no documented way to disable read caching in an ATA drive? It is only possible to disable the "read look ahead" part of some more complex "read caching" algorithm? Hale -- ++ Hale Landis ++ www.ata-atapi.com ++
