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 Post subject: Control hdd heads position while reading lba
PostPosted: February 2nd, 2025, 20:16 
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Joined: February 1st, 2016, 19:51
Posts: 137
Location: Cyprus
There is a behavior pattern when hdd head reading user sectors,they occasionally move from the reading area to a fixed area in the center of the platter and then return and continue reading(in sector by sector reading mode not reading fragmented files situation).
Does anyone know what part of the firmware controls this?
Is this s.m.a.r.t?


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 Post subject: Re: Control hdd heads position while reading lba
PostPosted: February 2nd, 2025, 20:51 
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Joined: April 7th, 2009, 21:36
Posts: 449
Are you talking about the parking zone on old drives before ramps were in use?

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 Post subject: Re: Control hdd heads position while reading lba
PostPosted: February 2nd, 2025, 21:16 
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Joined: February 1st, 2016, 19:51
Posts: 137
Location: Cyprus
No,modern hdds with ramp, the heads stop reading and move to the middle of the platter for a split second and then go back and continue reading from the original area.


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 Post subject: Re: Control hdd heads position while reading lba
PostPosted: February 4th, 2025, 3:00 
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Joined: October 3rd, 2005, 0:40
Posts: 4548
Location: Hungary
If this happens at a few sectors repeatably, then probably some servo sector(s) are damaged around the affected LBAs.
It can be head, preamp or PCB related as well, but less likely, and in this case it would happen independent of the LBAs being accessed.

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