@RicardoNC:
RicardoNC wrote:Bad head in one of the face of the platters????
Looking at the shape of the read throughput lines, I see no evidence to support that suggestion. All the graphs I have seen before where there is a weak head, include
noticeable sharp and significant "dips" in the throughput - your graphs do not show such "dips". That is the part of your questions that I expected to be able to help with, and with your new throughput graphs, my analysis of your suggestion is as above. Here are a few more comments, but no answers...
I have no explanation for the interesting shape of the access time graphs - but that does not mean there is a fault. The fact that this drive model is sold as being "eco friendly" means I would not be surprised to see deliberate performance (seek) limitations being done, to reduce power consumption. As I understand your posts, your only evidence for there being a "problem", are these graphs. It is possible to sometimes discover what seems to be a "problem" - and later find out (after discussions with the manufacturer) that this was an undocumented & deliberate firmware behaviour, which caused specific effects on performance. That happened to me... My point is just that an unexpected observation or behaviour, does not necessarily mean a fault.
Unfortunately you are trying to prove a negative i.e. trying to check that your drive is OK, since you have no proof of a
fault. That type of situation has big limitations. If someone does have the same model of drive and will run the same test for comparison, then their data would be interesting.
One final thought: If I was looking for any evidence of a problem with a disk, I would be looking at its full SMART data (my preferred utility is smartmontools, available in Windows & Linux versions), although interpreting that data is not an exact science.
You may want to consider looking at that SMART data from this drive. If it shows no problems, then that is inconclusive (because not all problems can be seen in SMART data); however if it
does show problems, then that evidence would be helpful to your investigation.
I hope you find the answers you are looking for.