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HDD Scan questions and observations
http://forum.hddguru.com/viewtopic.php?f=7&t=8702		 Page 1 of 1
Author:  Wabi [ March 24th, 2008, 9:31 ]
Post subject:  HDD Scan questions and observations
Hello forum,
today I used the HDDscan 2.8 software for testing several drives.

The first question which came up is what the difference might be between the verify and read modes. I only noted that read mode takes much longer than the verify mode, but I cannot find any help or FAQ entry which explains that.

Then I noted that the software is probably using the real time clock absolute values and not calculating time differences correctly. For example, when scanning an external USB drive the measured times depend on the activity of the other hard disks in the system. Do a copy of a large file or try surfing the internet while the HDDscan runs, that will greatly distort the results.

The program even miscalculates the measured times when switching between it's own MAP display and GRAPH display. The checkerboard pattern on the MAP obviously takes more CPU time than upgrading a few pixels on the GRAPH and the graph moves up a few millimeters when in GRAPH mode.

It is clear that the HDDSCAN suffers from internal inconsistencies and is not useable as a test and measurement tool in it's present condition. Hopefully future versions will be improved.

Regards,
Helmut Wabnig
Author:  Doomer [ March 24th, 2008, 10:31 ]
Post subject:  Re: HDD Scan questions and observations
Wabi wrote:
The first question which came up is what the difference might be between the verify and read modes.

Verify mode is using read verify command
Read mode is using Read command
Author:  b00822689 [ April 3rd, 2008, 14:04 ]
Post subject:  Re: HDD Scan questions and observations
I also notice that the speed is significantly slower when using "Read" mode rather than "Verify" mode.
It seems that it does not make sense since someone replied that for "Verify" mode, the program will "Read" and "Verify" but
if will only "Read" in "Read" mode.

I would like to know the turth.
Thank you
Author:  Doomer [ April 4th, 2008, 9:12 ]
Post subject:  Re: HDD Scan questions and observations
b00822689 wrote:
I also notice that the speed is significantly slower when using "Read" mode rather than "Verify" mode.
It seems that it does not make sense since someone replied that for "Verify" mode, the program will "Read" and "Verify" but
if will only "Read" in "Read" mode.

It looks like you don't understand what you talking about
Please download ATA standard from t13.org and read it, that should answer you questions
Author:  Doomer [ July 14th, 2008, 9:46 ]
Post subject:  Re: HDD Scan questions and observations
HDDScan 3.0 has been released
You can download it here - http://hddscan.com/
Author:  Doomer [ July 31st, 2008, 9:26 ]
Post subject:  Re: HDD Scan questions and observations
HDDScan 3.1 has been released
You can download it here - http://hddscan.com/
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