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The new SATA Slimline connector interface
New small-form factor and mobile enhancements specified in revision 2.6

The Serial ATA International Organization, also known as SATA-IO, today announced its latest Serial ATA specification – SATA revision 2.6 (PDF). The latest SATA revision 2.6 adds new physical and performance features to the previous SATA revision 2.5, also referred to as SATA 3.0Gbps, specification.

New physical features added to the SATA revision 2.6 include internal cable specifications for small-form-factor systems and mobile PC applications. SATA revision 2.6 specifies a new internal slim-line cable and connector. The new Slimline cable and connector target tightly packed small-form-factor systems. SATA-IO also defines the internal micro SATA connector with ultra mobile PCs in mind. The new internal micro SATA connector specification is for 1.8” hard drives only right now.

In addition to the small-form-factor and ultra mobile PC benefits of SATA revision 2.6, SATA-IO defines a new mini SATA multilane cable and connector. The new mini SATA multilane cable and connector specification is for internal and external SATA usage. Do not expect to see mini SATA multilane connectors on consumer desktop systems, however. SATA-IO defines the specification for use internally in high-bandwidth backplanes and externally for high-bandwidth external storage enclosures.

Physical enhancements aside, SATA revision 2.6 introduces new performance improvements to the SATA specification. Native Command Queuing, or NCQ, receives upgrades beneficial to desktop and notebook systems. NCQ priority enhancement is the latest feature and prioritizes data during complex workloads. On the mobile improvements sides of things, a new NCQ unload enhancement feature makes it way into the SATA specification. This new feature increases mobile SATA hard drive robustness, especially in drop-prone environments.


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RE: This doesn't make sense
By MPE on 3/7/2007 11:52:38 PM , Rating: 2
quote:
serialATA is 150MBps or 1.5Gbps [snip] you probably really mean 3.0Gbps, which is the 300MBps


1.5 Gb/s is not 150 MB/s. It is actually 187.5 MB/s. Nor 3.0 Gb/s equals 300 MB/s. It is actually 375 MB/s.


RE: This doesn't make sense
By InsaneScientist on 3/8/2007 12:48:48 AM , Rating: 2
Actually in this case it is.

The SATA specification transfers 10 bits per byte for some reason, though only 8 are needed.
Maybe a start and stop bit? I don't have a clue.
All I know is with SATA 1.5Gbps does equal 150MB/s and 3Gbps really does equal 300MB/s

Why can't they keep things consistent? >_<


RE: This doesn't make sense
By AndreasM on 3/8/2007 11:21:52 AM , Rating: 1
It's to reduce interference. However, those 10 bits still only contain 8 bits of real data, so technically you're both right. :)

Wikipedia has more if you're interested:
http://en.wikipedia.org/wiki/8B/10B


RE: This doesn't make sense
By Oregonian2 on 3/8/2007 7:14:58 PM , Rating: 2
1000BASE-X gigabit ethernet (over fiber) uses 8B/10B as well, so the gigabit serial stream really runs at 1.25 Gb. It gives DC balance as well as provides a minimum number of data edges from which to do clock recovery (else a large block of data that's all ones or all zeros would be a problem).


RE: This doesn't make sense
By Golgatha777 on 3/8/2007 11:26:25 AM , Rating: 2
http://en.wikipedia.org/wiki/8B10B

Ah, learn something new every day. SATA uses 8B/10B encoding, which means that SATA150 is really 150MB/sec actual data throughput due to the 8bit to 10bit encoding.


RE: This doesn't make sense
By mino on 3/8/2007 12:04:50 PM , Rating: 3
AFAIK those 2 bits are for ECC stuff.
1.5Gbps is physical speed while 150MBps is real data bandwith. Kinda.


RE: This doesn't make sense
By Golgatha777 on 3/8/2007 11:17:54 AM , Rating: 2
Thank goodness someone knows the math.

8bits = 1byte

8Gb = 1GB

3.0Gb/sec = 0.375GB/sec or 375MB/sec (10^3 conversion factor)

This is why many people say there is no performance difference between SATA150 and SATA300 because most hard drives have trouble getting near the 100MB/sec sustained transfer rate threshold, much less 187MB/sec or 375MB/sec.


RE: This doesn't make sense
By johnsonx on 3/9/2007 12:21:30 PM , Rating: 2
quote:
Thank goodness someone knows the math.


You're right, someone does... just not you.


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