sandungas
Developer
Exactlly, MHDD is awesomeYou can check smart even from usb, but i'm using sata ports. Because i can check disc in mhdd from sata. Mhdd give you info which sector "is going to be bad" by showing access time to every single sector. If you see that access time is too long then you know that sector probably not gonna live to long.
With it you can make a hdd surface scan, it reports the read latency of all the sectors (the scan only reads, after the scan the data is still there)... so you can see the "health" of every secor
After that you can make a low level format, and scan again to see if the problematic sectors revided (sometimes after a format the results are better because the sector was "demagnetized" and the writing process "magnetized" it again)
Also... with that scan you can find scratches in the hdd plate surface, aka "landings" of the hdd head (if you find lot of sectors damaged consecutivelly... thats a landing... the head touched the plated while it was spinning and made a scratch in the surface of the plate)
If you have damaged sectors you can remap them, this is much more complex, better dont try to remap without practising with other hdds before because you will run out of available sectors for remapping (usually hdds only has around 200 availables iirc... if you try to remap a landing of 1000 sectors you will fail because after the remap you will have 800 still damaged)
As a last resource when there are sectors damaged and no availables for remaping... the only thing left is to use the HPA functions (high protected area) that sets the limit of capacity of the hdd
Example... if you have an hdd of 160gb with a landing located around 110gb.... you can "cut" the drive capacity to 100GB and it will work normally
All this can be made with MHDD, is a must have, but as said... to practise better use a damaged hdd because the available remap sectors are like gold... if you run out of them the only options left are to cut the drive capacity with HPA or throw it out of the window
Edit:
More info for [MENTION=46]haxxxen[/MENTION]
Sometimes what happens is the heads of the hdd are a bit damaged, and has read/write problems
When the heads are damaged... the quality of the read/write depends of the distance of the area to the center of the plate
In the border is where more problems happens... while near to the center it reads better
By looking at the scan made with MHDD you can see where are the borders of the plates (it happens in all hdds, even in new ones, the speeds are always smaller in the borders). If the heads are damaged there will be lot of sectors spreaded here and there in this areas, and his positions can vary between scans
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