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Sean's SSD Buyers Guide & Information Thread - Page 5

post #41 of 2376
Hi Sean, nice thread thumb.gif

Just thought I'd add my "Why not to defrag an SSD" smile.gif

Defrag programs assume that LBA (Logical Block Addresse) are fixed to a specific physical point on the hard disk.
For example, LBA=1 is next to LBA=2, which is in turn next to LBA=3.
This is not the case for SSDs as LBAs for flash pages change based on its wear levelling algorithm!

Even if a file is stored in sequential blocks according to its LBA address (ie. the file is not fragmented according to the OS/defrag program), it might be sprawed across several flash chips!
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post #42 of 2376
Thread Starter 
Quote:
Originally Posted by ACHILEE5 View Post

Hi Sean, nice thread thumb.gif

Just thought I'd add my "Why not to defrag an SSD" smile.gif

Defrag programs assume that LBA (Logical Block Addresse) are fixed to a specific physical point on the hard disk.
For example, LBA=1 is next to LBA=2, which is in turn next to LBA=3.
This is not the case for SSDs as LBAs for flash pages change based on its wear levelling algorithm!

Even if a file is stored in sequential blocks according to its LBA address (ie. the file is not fragmented according to the OS/defrag program), it might be sprawed across several flash chips!

Adding thumb.gif
post #43 of 2376
Quote:
Originally Posted by Sean Webster View Post

Adding thumb.gif

Nice one cool.gif
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post #44 of 2376
Thread Starter 
Bump for help and benches! biggrin.gif
post #45 of 2376
Thread Starter 
post #46 of 2376
Thread Starter 
More info needed, need suggestions and ideas.

Thanks ^_^
post #47 of 2376
An SSD requires to be set to an allocation size of 4096. The SSD also requires an alignment of 4096 for increased performance and data transfer speed stability.

To format a SSD upon windows installation for Windows 7 x86 and x64, follow these insctructions.
Boot from windows 7 CD. Upon the welcome screen, select your language and continue to the main setup screen.
You will see a link in the corner that will say "Repair your computer." Click it.
A window will come up that asks you to "Use recovery tools that can help fix problems starting windows".
Make sure that option is set and click next.
Now click command prompt.
enter the following and press enter after each command.

disk part
list disk
select disk 0 (Make sure you select the correct hard drive from the provided list that will be on your screen after typing the entering list disk. For reference, i've written 0 to select hard drive number 0).
clean
create partition primary
align = 4096
format quick fs = ntfs
active
exit
exit (Again)
Now reboot the computer and install windows as normal. Remember, under the windows installer wizard, please do not select your SSD followed by the delete and new or format options otherwise this will kill everything you have just done. Feel free to format other hard drives or SSD's though in any form you wish to do so. The allocation size will be set to 4096 when you set the SSd to alignment 4096. This is done as windows is installing.
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post #48 of 2376
1. You don't need to run AHCI when using a SSD. By this, I mean you can run HDD's in raid with a SSD on its own. Whichever drives are not selected as raid will run in AHCI although the bios reports raid mode.

2. 4096 is the correct allocation size for newer storage devices. Why?
A hard drive or SSD is a chunk of free space (Let's talk in digital terms). So this free space needs to be divided into segments. By setting 1024, 1024 small little chunks can be help within a segment. By setting 4096, you can hold over 3072 more chunks per segment.

3. So yeah....why is this better?
Firstly we need to look at how information is stored and read on the hard drive. Let’s take a file. It's saved as small chunks that fit into a segment. If you use 1024 allocation size and the file will need 2000 chunks, the file will become split up. So the first 1024 chunks will be stored in the 1st segment whilst the remaining is stored into the next segment. Because the file is divided, it takes longer for the HDD/SSD and/or the OS to read/write the file. The file that requires 2000 chunks of a segment can fit into a 4096 segment. The file and information does not become scattered around. Of course, no matter what you do, chunks will become split up over time as you add and delete things on the computer and gaps in the structure appear and get filled by new files. The new files just become scattered to fill the gaps between the empty chunks that appear from previous files becoming deleted by software or the user.

4. Why to not use an allocation size higher than 4096?
Because if the units that hold tiny segments become too large of an open space, it will take the OS and the hardware far too long to find and interpret the information. It will also reduce the amount of formatted free space available to the OS and the user.
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post #49 of 2376
Just wanted to point out that those who looking into getting as SSD, many people will tell you not to buy OCZ.
Why?
Because, when one or two people on this forum say that something is rubbish, more people just join in and slate it. Then you get half of the forum hating something and they don't even know why.
OCZ provide some of the best SSD's that have ever been created. The vertex 3 SSD series are extremely powerful and excellent. They need SATAIII. That is how fast they are!
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post #50 of 2376
Was the SF BSOD issue fixed?
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