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 r72rock
Learning to Grow
Registered: 01/06/09
Posts: 577
Loc: Chicago 
Last seen: 3 months, 12 days
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 Defragging SSHD 
#15771312 - 02/06/12 09:55 PM (3 months, 20 days ago) |
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So I just recently got a SSD, and I've been loving it. I've read that you're not supposed to defrag them though.
Anyone know why this is? You can defrag Flash Drives, and I've done that before, and I don't think there's anything wrong with that. 
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现在
Refraining from all evil, not clinging to birth and death, working in deep compassion for all sentient beings, respecting those over you and pitying those below you, without any detesting or desiring, worrying or lamentation - this is what is called Buddha. Do not search beyond it. - Dōgen
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 koraks
Registered: 06/02/03
Posts: 16,174
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Re: Defragging SSHD [Re: r72rock]
#15771438 - 02/06/12 10:29 PM (3 months, 20 days ago) |
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Defragging isn't necessary because access times are near 0 anyway, so it doesn't help much. It damages the disk in the long term since they have a limited number of writes per memory location; defragging unnecessarily shortens the lifespan of the disk.
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r72rock
Learning to Grow
Registered: 01/06/09
Posts: 577
Loc: Chicago
Last seen: 3 months, 12 days
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Re: Defragging SSHD [Re: koraks]
#15771526 - 02/06/12 10:49 PM (3 months, 20 days ago) |
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Defragging isn't necessary because access times are near 0 anyway, so it doesn't help much.
I see, that makes sense. Thanks for answering. 
It damages the disk in the long term since they have a limited number of writes per memory location; defragging unnecessarily shortens the lifespan of the disk.
Now this I didn't know. If you can, and I hate to bother, but why does it only have a limited number of writes?
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现在
Refraining from all evil, not clinging to birth and death, working in deep compassion for all sentient beings, respecting those over you and pitying those below you, without any detesting or desiring, worrying or lamentation - this is what is called Buddha. Do not search beyond it. - Dōgen
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Seuss
Error: divide byzero
Registered: 04/27/01
Posts: 23,196
Loc: Caribbean
Last seen: 18 minutes, 59 seconds
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Re: Defragging SSHD [Re: r72rock]
#15772197 - 02/07/12 03:11 AM (3 months, 20 days ago) |
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> If you can, and I hate to bother, but why does it only have a limited number of writes?
Flash memory has something known as "write endurance" which is a limit on the number of times a cell can be written to (technically, erased) before the data it holds becomes unreliable. In the early days of flash devices, the write endurance was around 10,000 writes. Current devices are in the 2mil to 5mil range. Manufacturers are shooting for a ten-year lifetime of the device given normal I/O usage.
As to why, it is too technical for me to describe in detail. A good analogy is to think of a piece of paper being written to with a pencil, and erased with a pencil eraser. Pretty soon, after repeated writes and erases, the paper gets so thin that it can no longer be used. This is more or less what is happening with flash memory. Each erase uses a large voltage across the control gate pulling electrons off the floating gave via quantum tunneling. Each time this happens, the gates become slightly damaged. Over time, the gates completely wear out, just like a paper that has suffered a pencil eraser eventually wears out.
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Ythan
٩(●̮̮̃•̃)۶
Registered: 08/08/97
Posts: 14,939
Loc: NY/MA/VT Border
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Re: Defragging SSHD [Re: r72rock]
#15773001 - 02/07/12 08:34 AM (3 months, 20 days ago) |
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If you're running Vista or Windows 7 make sure you also disable the Superfetch service. It isn't automatically disabled when an SSD is detected, but it should be.
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r72rock
Learning to Grow
Registered: 01/06/09
Posts: 577
Loc: Chicago
Last seen: 3 months, 12 days
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Re: Defragging SSHD [Re: Seuss]
#15773632 - 02/07/12 11:22 AM (3 months, 20 days ago) |
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As to why, it is too technical for me to describe in detail. A good analogy is to think of a piece of paper being written to with a pencil, and erased with a pencil eraser. Pretty soon, after repeated writes and erases, the paper gets so thin that it can no longer be used. This is more or less what is happening with flash memory. Each erase uses a large voltage across the control gate pulling electrons off the floating gave via quantum tunneling. Each time this happens, the gates become slightly damaged. Over time, the gates completely wear out, just like a paper that has suffered a pencil eraser eventually wears out.
That is a fantastic analogy. Thanks for your time and the explanation.
If you're running Vista or Windows 7 make sure you also disable the Superfetch service. It isn't automatically disabled when an SSD is detected, but it should be.
Thanks for the tip. I'll be doing this next time I hop onto my computer. 
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现在
Refraining from all evil, not clinging to birth and death, working in deep compassion for all sentient beings, respecting those over you and pitying those below you, without any detesting or desiring, worrying or lamentation - this is what is called Buddha. Do not search beyond it. - Dōgen
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blujay
pass it b*ch!
Registered: 04/01/09
Posts: 4,721
Last seen: 20 days, 19 hours
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Re: Defragging SSHD [Re: r72rock]
#15806228 - 02/13/12 10:18 PM (3 months, 13 days ago) |
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Quote:
r72rock said:
Defragging isn't necessary because access times are near 0 anyway, so it doesn't help much.
I see, that makes sense. Thanks for answering.
It damages the disk in the long term since they have a limited number of writes per memory location; defragging unnecessarily shortens the lifespan of the disk.
Now this I didn't know. If you can, and I hate to bother, but why does it only have a limited number of writes?
At a LAN party a type douche smart ass greek geek was blathering on and on about his "$3,000" "custom rig" to the only chick in the room. It was an obnoxious, ostentatious FULL-ATX beast with six ten-inch fans, two graphics cards and enough LED's to grow a small pot plant. Directly across from my nondescript slick-black shitty OEM-BTX case the thing looked like a circus.
On top of the braggart's tower was a dock. A dock with one SSD in it.
And I did say so politely: I wouldn't run a Minecraft server on that?
His reply a blank stare, silence in lieu of further explanation my revenge.
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wat man rly
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