On Wednesday 15 December 2010 11:58:13 Mark Knecht wrote: > On Wed, Dec 15, 2010 at 11:35 AM, Grant Edwards > > <grant.b.edwa...@gmail.com> wrote: > > On 2010-12-15, Andrea Conti <a...@alyf.net> wrote: > >>> E-SATA != SATA !!!! > >> > >> Nah. They are *exactly* the same. > > > > Not according to Wikipedia -- it says the electrical specs for eSATA > > are different than the specs for "normal" SATA. I've seen that stated > > in other places as well. I don't have copies of the two specs, so I > > can't say I'm 100%, but I believe the Wikipedia page. > > It is true, and has to be for cost reasons. > > 1) Internal SATA drives are at the end of a single cable and don't > require hot-plugging logic be built into the SATA port driver on the > SATA controller because they are always powered up. (They are inside > the case) > > 2) External SATA drives are at the end of 1) an internal cable, 2) a > case SATA-eSATA connector, and 3) an external eSATA cable along with > whatever is inside the eSATA case. eSATA compatible ports must include > hot-plugging logic. > > For cost/simplicity reasons chip manufacturers are free to remove > hot-plugging logic from any port for which they don't intend eSATA > compatibility. > > The logic and timing of the signals on SATA and eSATA cables is > (TTBOMK) intended to be identical. What those signals look like at > different places in the cable chain will be different. > > - Mark
and you have sources to support that claims and did not just make it up.
