[Ham-Computers] RE: SATA

[Hsu, Aaron (NBC Universal)]

Just FYI...

ATA-5 (aka UDMA/100) - 100MBps (that's a capital "B" for Bytes)
ATA-6 (aka UDMA/133) - 133MBps

SATA/150 = 1.5Gbps (that's a lowercase "b" for bits)
  (SATA is 80% effficient, so 1.5Gbps * 0.8 / 8-bits per byte = 150MBps)

SATA/300 = 3.0Gbps = 300MBps

UltraSCSI 160 = 160MBps
UltraSCSI 320 = 320MBps

SAS (Serial Attached SCSI) - 3.0Gbps

USB 1.x - 12Mbps = 1.5MBps
USB 2.0 - 480Mbps = 60MBps

IEEE-1394a (aka FireWire 400) - 400Mbps = 50MBps
IEEE-1394b (aka FireWire 800) - 800Mbps = 100MBps


Although USB2.0 has a higher max bandwidth than FW400, FW400 is actually faster due to lower protocol overhead.  Most USB 2.0 hard drives max out below 30MBps and many FW400 drives can sustain 40+ MBps.  Oh, and SAS is very similar to SATA (even with similiar connectors), but different protocols.  SAS is found on servers much the same way SCSI was found on servers.

73,

  - Aaron, NN6O


-----Original Message-----
Sent: Tuesday, December 30, 2008 8:56 PM
Subject: Re: [Ham-Computers] SATA

Loren Moline WA7SKT wrote:
> Hello,
>
> Can someone tell me why they have gone to Serial ATA drives?
>
> How can someone say that serial could be as fast as parallel data 
> transfer.
>
> Just like USB external drives. No matter how fast USB is I can't 
> believe it wouldn't be slower than parallel data transfer.
>
>  
> Loren   WA7SKT
>

It is not parallel per say....but don't know why Serial is faster.
Now USB is much faster, don't know if it is faster than scsi or not but 
it is faster than the parallel or serial port.

-- 
All the Best & 73's
Dale Miller, KC2CBD
Tennessee
Ham Operator since 1997
Member of YahooPipesmokers and ASP since February 2005

Registered Linux User: #317401
Linux since June 2003

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