transfer speed rate vs bandwidth throughput speed

so i am reading that drives like SATA 3 has a date transfer rate (write speed?) of 3 Gbps. And the bandwidth throughput, which is supported by the interface, is up to 300MB/s.

how do these to speeds, 6 Gbps and 600MB/s, relate to each other in terms of speed of the hard drive?

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Comments

Edin

Not too sure as I can't fully understand the question itself, but as per your example; your SATA3 may have a maximum transfer speed of say 3Gbps, whilst the actual harddrive can only output 300MB/s(?) as far as I can gather from your question.

Cheers.

Jmart10

edit, nevermind i think i got it now

Asif Dasl

Good question...

6 Gbit/s = 750 MB/s
This is the theoretical maximum speed over 1 channel/port.

But most hard drives only get about 100-200MB/s and SSDs get about 450 to 550MB/s and in SSD's RAID-0 you can get over 1000MB/s (over 2 channels) and some of the new PCI Express SSDs are getting over 1500MB/s.

Have a read of these for a thorough explanation of the math:
SSD Throughput, Latency and IOPS Explained - Learning To Run With Flash | The SSD Review
http://www.ssdfreaks.com/content/599/how-to-convert-mbps-to-iops-or-calculate-iops-from-mbs

http://en.wikipedia.org/wiki/List_of_device_bit_rates#Storage