Gary,

There is no data written to the media with a VERIFY command. There is data sent to the device that is only to be compared with what is already on the media if the BYTCHK bit set to one. In that case the protection information moved with the data from the initiator to the target is used to check the data that is sent based on the requirements listed in table 64. The corresponding data is read of the disk and is checked using protection information read from the media with the data as defined in table 63. Then the data from the initiator and the data read from the media is byte checked and the protection information is byte checked as defined in table 65.

Bye for now,
George Penokie

Dept 9A8 030-3 A410
E-Mail:    gop@us.ibm.com
Internal:  553-5208
External: 507-253-5208


Gary.Franco@Emulex.Com
Sent by: owner-t10@t10.org

11/20/2006 02:11 PM

To
<t10@t10.org>
cc
Subject
Differences between WRPROTECT and VRPROTECT





Is it the specification or my lack of understanding – here is the issue:

Isn’t a VERIFY for all intents and purposes the same as a WRITE command as the DATA is sent to the device for verification.

In a WRITE command if the WRPROTECT bits are 000 (no protection data available) the target device create its own protection information and writes it to the disk.

This same operation is not called out for the VERIFY, therefore wouldn’t all the checks fail by default?

__________________________________
Gary Franco Consultant Engineer
Emulex Network Systems
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