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Old Nov 17, 2012, 11:22 AM   #1
MacOSXuser
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What's the disk read/write speed (SSD)?

I've got a Vertex 4, speed/write should be over 500mb/s but when I test with AJA system test, it came out less than 300mb/s for read/write.

What speed r u guys getting from your SSD?
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Old Nov 17, 2012, 01:03 PM   #2
philipma1957
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test it with black magic also test it with xbench (disk only) the data on aja involves compression and none compression.

you do realize that write read numbers of 500 only mean something if you have a second ssd and you are cloning to it. on the test below i do 324 write and 271 read. and unless I copy it to a second ssd those numbers don't help me. but on random 4k I write at 113 and read at 13. those are your big numbers to worry about. the second test is on a raid0 2x 2tb = 4tb volume. compare it to the first test.

it will allow long fast copies but it won't do short random work well since it is a pair of mechanical hdds that is normal. I do long copies to it from my samsung ssd. and then use it to host tv shows in my house. see what you get for your xbench scores and black magic scores
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Old Nov 17, 2012, 01:18 PM   #3
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2012 Mini. SSD from Apple, (Samsung 830 with custom firmware)
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Old Nov 17, 2012, 01:35 PM   #4
motrek
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Quote:
Originally Posted by MacOSXuser View Post
I've got a Vertex 4, speed/write should be over 500mb/s but when I test with AJA system test, it came out less than 300mb/s for read/write.

What speed r u guys getting from your SSD?
I understand the desire for a product you bought to behave exactly as expected, but seriously, is there any practical difference to you between a 300 MB/s and a 500 MB/s drive?
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Old Nov 17, 2012, 01:49 PM   #5
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my speed:


----------

how do you guys able to get so much write speed...

yes i also have a second SSD, but currently USB 2.0 because i still need the SATA cable to make that a second SSD.
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Old Nov 17, 2012, 02:02 PM   #6
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Old Nov 17, 2012, 04:15 PM   #7
MatthewAMEL
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i7 Mini with Apple SSD.
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Old Nov 17, 2012, 05:23 PM   #8
dasx
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Quote:
Originally Posted by motrek View Post
I understand the desire for a product you bought to behave exactly as expected, but seriously, is there any practical difference to you between a 300 MB/s and a 500 MB/s drive?
Try running in terminal, for instance:

$ rsync -aEP /Documents/folder_with_2_100GB_files/ /Downloads/

Watch at the process time and you'll see the differences between 300 and 500MB/s.

But yes, I agree with you. In regular use one can't really feel the difference. (Except if you're really into copying really large files into your same drive)

Quote:
Originally Posted by MacOSXuser View Post
[/COLOR]how do you guys able to get so much write speed...
Well, I guess your drive doesn't use a Sandforce Controller. Check the MBA forum. People who got the 128GB are getting lower speeds than the ones who got bigger ones. Why? Because 128GB drive is Toshiba and the others are Samsung's 830 series. (250/450 vs 450/450)
First one doesn't use Sandforce Controller, second one does. Difference is no sandforce controller doesn't like uncompressed data as much as the other one.

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