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  1. How does an SSD determine what data should go in it's cache memory for optimised retrieval?
  2. When a file is removed from an SSD, how does the SSD make sure the free space can be optimally written to?
  3. When a file is appended (changed, made larger), how does an SSD make sure the appended portion of the file can be optimally retrieved?
  4. Does file fragmentation exist on SSDs? If so, does it have an impact on the performance of the cache memory?

edit, Note: If you seem to post a response without reading this I will downvote you.

asked Jul 26 '10 at 03:33

Seb's gravatar image


edited Jul 26 '10 at 05:18

no it does not effect the speed of ssds. in fact defragging them just causes unnecessary wear

answered Jul 26 '10 at 04:07

Tim%20Fontana's gravatar image

Tim Fontana

I believe it is unfortunate that you didn't even bother to read the body of the question.

(Jul 26 '10 at 05:16) Seb Seb's gravatar image

i did read it, i just let you know that there is no point in defragging an ssd

(Jul 26 '10 at 05:54) Tim Fontana Tim%20Fontana's gravatar image

Did I ask if there's any point in defragging an SSD?

(Jul 26 '10 at 05:55) Seb Seb's gravatar image

you said is fragmentation an issue in ssds, i said it wasnt and that there was no point

(Jul 26 '10 at 08:40) Tim Fontana Tim%20Fontana's gravatar image

Down voting everyone who doesn't completely answer your question is stupid. Everyone is going to be afraid to answer because you might down vote them. This isn't an exam in school. Your question may be answered in more than one person's response.

(Jul 26 '10 at 11:02) TechRob TechRob's gravatar image

This answer makes no attempt to answer (or even acknowledge) any of my questions. If he had said something like "I don't know the answer to the other questions, but I believe file fragmentation does not affect the speed of an SSD" then I wouldn't have downvoted him. The very fact that he clearly didn't even bother to read my questions was the reason he got downvoted.

timf009: You're still missing the point. I didn't mention defragmentation. I asked a series of 4 questions (5 if you include the topic). You answered the question in the topic, and that is all.

(Jul 26 '10 at 11:09) Seb Seb's gravatar image
showing 5 of 6 show all

File fragmentation occurs on both HDD and SSD. The impact can be sever for both. The ability to defrag an SSD could be counter productive as you will invariably occur invalid wear and tear on the device if you use an incorrect defrag policy.

Think carefully about your use of SSD, make sure you understand how fragmentation can impactsystem performance prior to any defrag activity.

And don't be so pompous as to downgrade well meaning contributors because they can't answer in exactly the way you think.

answered Aug 23 '12 at 10:58

besttech's gravatar image


fragmentation is one of the reasons SSD is not ready for prime time the #1 killer of SSD is write and remove (delete) its great for data that is goingto be kept and held like music libraries its good as a boot drive but as I under stand SSD slows boot down a lot ..

answered Aug 23 '12 at 11:25

jadtechnic's gravatar image


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Asked: Jul 26 '10 at 03:33

Seen: 2,091 times

Last updated: Aug 23 '12 at 11:25