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Cable transfer speeds

Discussion in 'Storage' started by MoonPig, Oct 5, 2008.

  1. MoonPig

    MoonPig

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    Hi,

    I'm writing about cable transfer rates for some Assignment work for College. But the internet isn't been clear on actual speeds. Basically I need to know what the real speeds are for:

    SATA (it claims 1.5Gbps, 3Gbps and 6GBps. But other things claim 300Mbps)
    IDE (claims 133Mbps)
    Floppy Cable (can't find anything on it)

    Thanks in advance.
     
  2. ghost101

    ghost101 New Member

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  3. Urbklr

    Urbklr

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    Sata 1 150MB's
    Sata 2 300MB's
    IDE 133MB's
    Is floppy the same as IDE?

    I think those are right, someone will correct me if wrong.
     
  4. ghost101

    ghost101 New Member

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    Nope its 192MB/s, 384MB/s, if you convert from1.5gbps and 3gbps. But the wikipedia article says.

    SATA 1.5 Gbit/s SATA 3 Gbit/s
    Frequency 1500 MHz 3000 MHz
    Bits/clock 1 1
    8b10b encoding 80% 80%
    bits/Byte 8 8
    Real speed 150 MB/s 300 MB/s

    Not sure why the real speed isnt a straight conversion.

    edit: whats 8b10b encoding?
     
  5. MoonPig

    MoonPig

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    yea, thats whats confusing me. Its claiming Gbps but saying 'real' speeds in Mbps :/
     
  6. ghost101

    ghost101 New Member

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    Thats simply a bits to bytes conversion. 8 bits per 1 byte. But its not a straight conversion in this case due to 8b10b encoding. Not sure what that is.

    The calculations are like this

    1500mhz with 1 bit per cycle. So 1.5 gbits per second. But for some reason only 80% is used meaning 1.2gbps. This 1.2Gbps/8 = 150MB/s.

    I don't know if these are Gib/Mib. If yes the calculations are slightly different. Probably not Gib and Mib since thats the standard hard drives follow and the wikipedia calculations then make sense.
     
    Last edited: Oct 5, 2008
    MoonPig says thanks.
  7. MoonPig

    MoonPig

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    ah ok, thanks alot. That makes sense now.
     
  8. ghost101

    ghost101 New Member

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