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Please do not post questions about data recovery cases here (use this forum instead). This forum is for topics on finding new ways to recover data. Accessing firmware, writing programs, reading bits off the platter, recovering data from dust...Purpose of Write-Read-Verify Feature?
April 12th, 2016, 5:53
Hi,
I'm doing some research on the features in HDD.
Current having a question on this Set feature Write-Read-Verify.
1. The ATA indicated 4 modes, are they all doing just write read then verify?
2. If there is a miscompare, what will happen to the drive?
3. What is the purpose of this feature?
4. For testing purpose only because you want to check if data written in and it can be read out correctly?
I'm doing some research on the features in HDD.
Current having a question on this Set feature Write-Read-Verify.
1. The ATA indicated 4 modes, are they all doing just write read then verify?
2. If there is a miscompare, what will happen to the drive?
3. What is the purpose of this feature?
4. For testing purpose only because you want to check if data written in and it can be read out correctly?
Re: Purpose of Write-Read-Verify Feature?
March 3rd, 2017, 5:13
just test the surface sector bad or not , read verify sector means not read into disk buffer on pcb, just check bad or not. and you can test 256 sectors or more each time ,but read cmd just read one sector each time ,if you care the data 
. or readmulti read 16 sectors once, if you care the data.
So you also can use udma control to finish the test, it's all the same. and speed is great too.
all above:The two commands are nothing special
. or readmulti read 16 sectors once, if you care the data.So you also can use udma control to finish the test, it's all the same. and speed is great too.
all above:The two commands are nothing special
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