Albretch Mueller wrote: > On 2/25/23, to...@tuxteam.de <to...@tuxteam.de> wrote: > I am not using a USB enclosure per se, but a regular internal disk > externally attached using a USB/power interface. I will test the USB > cabling using a better looking, newer USB cable.
If you can swap the USB/SATA interface too, that's a pretty likely failure point. > The laptop + external disk combination I am using right now has a > very pore transfer rate. I need at least three times that around > 100MB/sec: > > $ date; time sudo hdparm -tT /dev/sdc > Sat 25 Feb 2023 12:03:43 PM UTC > > /dev/sdc: > Timing cached reads: 29458 MB in 2.00 seconds = 14754.70 MB/sec > Timing buffered disk reads: 112 MB in 3.04 seconds = 36.87 MB/sec The top number is, of course, bogus. The bottom number is typical of a USB2-connected disk -- the often cited "480Mb/s" connection speed has a lot of protocol overhead and inefficiency. About 42MB/s is the best you can hope for. A USB3 port, if you have one available, and a USB3-SATA3 interface that supports UASP (basically, SCSI over USB), can manage 100-120MB/s on a spinning disk. -dsr-
