J. Roeleveld wrote: > On Tuesday, July 01, 2014 11:06:59 AM Helmut Jarausch wrote: >> On 07/01/2014 10:58:45 AM, Dale wrote: >> Probably not. All of my external USB3 disks have a separate power >> supply. > I only know of 2.5" USB-drivers that are powered via the same USB-cable. > Never seen 3.5" ones that are USB-powered. > > I use 2.5" drives for my backups, as they are designed for laptop use, I have > the feeling they are a bit more robust when it comes to accidental bumps.
I thought those things looked like they had their own power. Neat. > >>> root@fireball / # hdparm -tT /dev/sdb >>> >>> /dev/sdb: >>> Timing cached reads: 6604 MB in 2.00 seconds = 3303.39 MB/sec >>> Timing buffered disk reads: 542 MB in 3.01 seconds = 180.33 MB/sec >>> >>> root@fireball / # >> Try a real life example like dd. I have seen the above mentioned speed >> on disks with a file system on it which does limit the speed anyway. > +1 > > -- > Joost > > I watched the dd process when I was erasing the old drive. I got about the same results. It started out a little over 200 and went as low as 170 or so close to the end. On average, about what hdparm shows. Close enough it seems. ;-) Dale :-) :-)
