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In the ATA RAID1 (disk mirroring) application, R/W Long has been used to perform forced error on the rebuild drive in certain LBA (when the host cannot get valid data from the corresponding LBA in source drive during the mirror rebuild process). This will force the OS to recognize the error situation when OS is trying to access the data from that LBA. Without R/W Long, it will require a much more complicated error handling algorithm to handle the situation. Raymond Liu -----Original Message----- From: Hale Landis [mailto:[EMAIL PROTECTED]] Sent: Tuesday, March 12, 2002 9:29 AM To: [EMAIL PROTECTED]; Harlan Andrews; sraposo Subject: Re: [t13] Read/Write Long This message is from the T13 list server. On Tue, 12 Mar 2002 09:15:21 -0800, Harlan Andrews wrote: >This message is from the T13 list server. >Although Read/Write long may have been deleted from the spec, it is STILL >a requirement for several Host vendors. Drive suppliers should be very >careful not to actually remove the Read/Write long commands. WHY? For what purpose do these host vendors still require these commands? They have no value, can not really test anything (unless the drive vendor has enhanced them in some way that is different than the way the traditional R/W Long worked in which case they should probably be using some vendor specific command code instead of the old R/W Long command codes). *** Hale Landis *** www.ata-atapi.com ***
