Data recovery and disk repair questions and discussions related to old-fashioned SATA, SAS, SCSI, IDE, MFM hard drives - any type of storage device that has moving parts
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Where the physical sectors actually are?

March 20th, 2013, 19:29

Hi all,

Just wandering where the physical sectors really are located on hard drive's platter?
I mean, are they growing up by cronical numbers from the center of the platter towerds outside or outside towerds into the inner cylinder?
In other words:
Let take for exmaple 1Tb drive with 3 platters.
The sectors range is between 0..1,954,000,000
So are the sectors grow up from the inner cylinder towreds the outside cylinder or it goes from outside towreds the most inner cylinder so in the sylinder which is close to the motor it is the location of the 1,900,000,000-1,954,000,000 sectors?

Yes it is kind of newbie question but I couldn't find a real answer by searching on google..

Re: Where the physical sectors actually are?

March 20th, 2013, 20:07

You can answer your main question by using a benchmark utility - the faster throughput (e.g. doing sequential reads) will be from the sectors near the outside edge on modern drives, due to ZBR. In my experience, the sectors near the outer edge are the low LBA numbers on modern drives. You can confirm this by displaying the zone table info from a drive (e.g. Seagate terminal). Hope that short info helps.

Re: Where the physical sectors actually are?

March 21st, 2013, 4:25

Vulcan hit the nail on the head :)
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