In our experience, the performance hit has more to do with the USB-attached device, than it does to any other cause... the quality and performance differs wildly depending on the USB device configuration, brand and model... and cable.
But any other device is always slower than the direct ATA connect. I would not want to do many 550 GB transfers if I was supposed to be in a hurry. - - - - - The art of being wise is the art of knowing what to overlook. - -- --- ---- ----- ------ William James On Mon, Jan 18, 2010 at 11:55 PM, Aryeh Goretsky (home) <[email protected]>wrote: > Hello, > > An advantage to placing the hard disk drive in the UltraBay and using > a USB-attached CD or DVD drive is that the hard disk drive will be > accessed at PATA speeds, whereas some protocol conversion has occurs > on the USB interface in order to bridge the USB and ATA protocols. > > I have noticed a 30% performance hit on average in throughput for USB > over direct-attached PATA hard drives. Other's experiences differ, I > am sure. This may not seem like a big difference, but I once had to > copy about 550GB of data between two USB attached hard disk drives, > and this took the better part of a day. Shaving 30% off of that > would have been very nice. :) > > Regards, > > Aryeh Goretsky > > > At 10:00 AM 1/17/2010, you wrote: > > Message: 2 >> Date: Sat, 16 Jan 2010 20:04:41 -0800 >> From: John Serafin <[email protected]> >> Subject: Re: [Thinkpad] T43 hardware query >> To: Jeffrey Race <[email protected]> >> Cc: Thinkpad Users Group <[email protected]> >> Message-ID: <[email protected]> >> Content-Type: text/plain; charset=us-ascii >> >> >> On Thu, Jan 14, 2010 at 09:17:06PM -0500, Jeffrey Race wrote: >> > What device can I use to make bit-by-bit mirror >> > my T43's HDD to a duplicate drive? I can use >> > DFSee s/w. In my 600X I used the drive tray >> > in place of the CD drive. What is the comparable >> > T43 hardware device? >> > jeffrey race >> >> Second HDD adapters are great for additional internal drives, but I >> think the various USB to SATA/IDE adapters are better for drive >> copying. They are around $20 at computer stores and online. For >> laptop drives, it helps to also use a USB Y cable to make sure there >> is enough power. >> >> This also leaves the CD drive available to boot the copying software, >> which is safer than copying a drive that is booted. >> >> -- >> This message not checked for viruses, etc., because it is plain text. >> John P. Serafin | Operating a bicycle is more like driving than riding. >> jps at pobox com | Operating an automobile is more like riding than >> driving. >> > > _______________________________________________ > Thinkpad mailing list > [email protected] > http://stderr.org/cgi-bin/mailman/listinfo/thinkpad > _______________________________________________ Thinkpad mailing list [email protected] http://stderr.org/cgi-bin/mailman/listinfo/thinkpad
