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ontariotech
 Post subject: How full does a HDD before performance is affected?
PostPosted: January 19th, 2011, 9:54 
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Joined: March 8th, 2009, 15:41
Posts: 88
Location: Hiding Between the Platters
For an 160GB S-ATA drive.

How full does the drive have to be before you notice a lag
in performance.

From my experience, when the drive is 95 per cent full, things really slow down.

What is your experience?
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guru
 Post subject: Re: How full does a HDD before performance is affected?
PostPosted: January 19th, 2011, 10:06 
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Joined: May 5th, 2004, 20:06
Posts: 2782
Location: England
It's an O/S issue rather than hardware

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Russwinters
 Post subject: Re: How full does a HDD before performance is affected?
PostPosted: January 19th, 2011, 12:47 
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Joined: July 16th, 2008, 17:52
Posts: 489
Location: Long Beach, California
Well, it is *kind of* a hardware issue as well.


Drives access the sectors at the end (inner most part) of the drive slower then the outer and middle, no matter what. So if you where to put even a small amount of data only at the end of the drive it would be about as slow as if it was full.

The other factor that causes drive slowing is fragmentation.

Also bad sectors will cause the drive to slow down greatly because the heads will have to seek to reserve sectors periodically and then back to the track they where on.
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unknown
 Post subject: Re: How full does a HDD before performance is affected?
PostPosted: January 19th, 2011, 18:24 
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Joined: October 21st, 2007, 8:48
Posts: 1721
I vote for a delayed sectors that makes the drive very slow.
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BlackST
 Post subject: Re: How full does a HDD before performance is affected?
PostPosted: January 21st, 2011, 4:10 
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Joined: July 18th, 2006, 3:05
Posts: 7476
Location: ITALY
I have another opinion : O/S plays a big role, but the overall speed is different if data is being read from OD or ID (physical location). So , depending on how the drive was filled it may affect performance. This depends also on how servo is structured and how zones are structured.
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guru
 Post subject: Re: How full does a HDD before performance is affected?
PostPosted: January 21st, 2011, 10:16 
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Joined: May 5th, 2004, 20:06
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And what will happen with a solid-state drive (SSD)? :idea:

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BlackST
 Post subject: Re: How full does a HDD before performance is affected?
PostPosted: January 21st, 2011, 13:46 
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Joined: July 18th, 2006, 3:05
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Nothing. Access time in semiconductor memories , as far as I know, is almost independent from the accessed location or if there are differences , they can be neglected. Out of curiosity I have searched on many databooks I have and there is no mention about it .
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pclab
 Post subject: Re: How full does a HDD before performance is affected?
PostPosted: January 27th, 2011, 4:47 
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Joined: July 12th, 2010, 4:38
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Most problems with SSD speed is more about the PC hardware configuration, or some fw bug, like the one that afected the Intel SSD drives.

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craig6928
 Post subject: Re: How full does a HDD before performance is affected?
PostPosted: February 20th, 2011, 4:32 
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Joined: February 15th, 2006, 3:38
Posts: 1079
Location: canada
guru wrote:
And what will happen with a solid-state drive (SSD)? :idea:



the first thing that will happen you will smell some burning :mrgreen:

then a melt down :lol:
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craig6928
 Post subject: Re: How full does a HDD before performance is affected?
PostPosted: February 20th, 2011, 4:33 
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Joined: February 15th, 2006, 3:38
Posts: 1079
Location: canada
O/S issue not a hard drive as it reading the file structure of the drive
so when you get about 95% full
the drive will slow down as its trying to read all the information on the file structure
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