SSDs - Why SATA III

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Christopher Gonzalez

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Jul 27, 2013
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Hey Guys!

Just wondering, why is SATA III a thing when most SSDs Read/Write speed is only around 500-550 MB a second? I'm pretty new to this world so sorry if this is a really stupid question...

Thanks!
 
Solution
Sakkura
SATA2 allows up to a theoretical maximum of 300 MB/s. SATA3 allows up to a theoretical maximum of 600 MB/s. The reason most SSDs have sequential throughput in the mid-500s is that realistically that's all you'll get with SATA3. There are newer interfaces on the way to support faster SSDs - M2 and SATA Express.
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Sakkura

Sakkura

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Aug 22, 2011
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SATA2 allows up to a theoretical maximum of 300 MB/s. SATA3 allows up to a theoretical maximum of 600 MB/s. The reason most SSDs have sequential throughput in the mid-500s is that realistically that's all you'll get with SATA3. There are newer interfaces on the way to support faster SSDs - M2 and SATA Express.
 
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Christopher Gonzalez

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Is it by 6 Gbps they don't mean 6 GB a second transfer speed? I don't know if that's what it really means if it maxes out at 600 MB/s...
 
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rolli59

rolli59

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Correct http://en.wikipedia.org/wiki/Serial_ATA
 
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Sakkura

Sakkura

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6 Gbps = 6 Gigabits per second. There are 8 bits per byte, and another 2 bits used for signal integrity. So you have to divide by 10 to get it in bytes.
 
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Christopher Gonzalez

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That makes much more sense... Just, what exactly do you mean by signal integrity? I understand everything else.

Thanks!
 
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Sakkura

Sakkura

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Well, imagine you were sending a piece of data. At one point, it just happens to have a long string of 1s. 111111111111111111111111111111111111111111111 etc. The signal is sent by changing a voltage, but when there's a long string of 1s (or zeros) the voltage just stays the same for a long time, and eventually the receiving controller may lose count of exactly how many 1s have been transmitted, since there's no divider between them. So what they do is put in some bits that do not carry data, but serve to mix things up and prevent problems like that.
 
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Christopher Gonzalez

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Jul 27, 2013
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Oooohhhh! That makes perfect sense! Thanks so much for the help! I was just curious... I'm trying to get really into this kinda thing! Thanks!
 
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