Questions about specifications of an SSD drive

Ragahv

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Dec 30, 2012
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I choose to buy an ssd like this one from ebay: http://www.ebay.com.au/itm/SanDisk-240GB-SSD-Plus-2-5-SATA-III-520MB-s-Internal-Solid-State-Drive-PC-Mac-/151752726067?hash=item23552ad633

I need to know the following:

- The hard drive has 500MB/s read speed and a write speed of 400MB/s and a Interface: SATA Revision 3.0 (6 Gb/s). What is the differance between 500Mb/s, 480Mb/s and 6Gb/s hard drive speed? why are there 3 speeds specified on the hard drive specs? if the write speed is 500Mb/s then why is there a listing of 6gb/s of the sata interface and what does that really mean if the sata 3 speeds are 6gb /s or 7gb/s and also a write speed of 500Mb/s? Im really confused. Thanks so much!!!

 
Solution
The read speed of the SSD is approx up to 500MB/s, the write speed is approx up to 400MB/s. The interface(the SATA 3) allows a bandwidth up to "6Gb /s" which equals to 600MB/s.

atheus

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Aug 2, 2010
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You have to pay close attention to the "b" in transfer rates. Capital B means "Byte", while lower case b means "bit". A byte is 8 bits, (though sometimes it's more depending on whether the protocol uses parity bits to correct errors). At the very least, when you see something written as Mb/s, you need to divide by 8 to figure out how many MB/s that is.