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Some interesting info/ideas on SSD's


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#1 was_jaclaz

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Posted 03 November 2009 - 12:36 PM

Here ;) :

http://www.anandtech...aspx?i=3531&p=1

:cheers:

jaclaz

#2 TheHive

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Posted 09 November 2009 - 01:57 AM

Man thats a lot of reading. I stopped after the first page.
Can you paraphrase the focus of the article. I was at the point that SSD's get slower as time passes and you use them more.

#3 was_jaclaz

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Posted 09 November 2009 - 10:41 AM

Man thats a lot of reading. I stopped after the first page.
Can you paraphrase the focus of the article. I was at the point that SSD's get slower as time passes and you use them more.


Well, you should actually do your homework :dubbio:, anyway just read this:
http://www.anandtech...aspx?i=3531&p=8
and of it, just this:

Now let’s think about what’s just happened. As far as the OS is concerned we needed to write 12KB of data and it got written. Our SSD controller knows what really transpired however. In order to write that 12KB of data we had to first read 12KB then write an entire block, or 20KB.

Our SSD is quite slow, it can only write at 1KB/s and read at 2KB/s. Writing 12KB should have taken 12 seconds but since we had to read 12KB and then write 20KB the whole operation now took 26 seconds.

To the end user it would look like our write speed dropped from 1KB/s to 0.46KB/s, since it took us 26 seconds to write 12KB.

Are things starting to make sense now? This is why the Intel X25-M and other SSDs get slower the more you use them, and it’s also why the write speeds drop the most while the read speeds stay about the same. When writing to an empty page the SSD can write very quickly, but when writing to a page that already has data in it there’s additional overhead that must be dealt with thus reducing the write speeds.


And of the above just this:

When writing to an empty page the SSD can write very quickly, but when writing to a page that already has data in it there’s additional overhead that must be dealt with thus reducing the write speeds.


Which can be summed up in:
When using SSD a TRIM enabled OS is advised.

jaclaz




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