On Saturday, 14 March 2020 14:44:55 GMT [email protected] wrote: > On 03/14 02:38, Michael wrote: > > On Saturday, 14 March 2020 11:15:43 GMT [email protected] wrote: > > > Hi, > > > > > > I bought a LogiLink QP0027 QuickPort. > > > This is a external 3.5/2.5" HDD "docking station". > > > > > > It has a power supply, a USB3.1 port, an ON/OFF switch. > > > > > > Normal doing would be: > > > Switch docking station off > > > Connect docking station and PC with USB cable. > > > Connect Power Supply and docking station > > > Plug Power Supply into mains > > > Insert HD > > > Wait for HD to spin up > > > Check /dev for new device. > > > > I don't know how you determined the above sequence of actions to be > > 'normal'. I have a Startech HD - USB 3.0 docking station, probably coming > > out of the same Chinese factory, but I am following a different > > procedure. > > > > 1. Connect the PSU to the docking station. > > 2. Insert the HD. > > 3. Switch on power to the docking station. > > 4. Plug in the USB cable into the PC. > > > > Steps 1. and 2. above are interchangeable. > > Steps 3. and 4. above are interchangeable. > > Steps 2. and 3. above and NOT interchangeable. > > > > The hard drive is recognised as a USB device by udev and any partitions on > > it become available for mounting. Are there some instructions available > > for your docking station which direct a different sequence of actions? > > Hi, > > the manual is "iconized" (following "a picture is worth a thousands > words" - read as "we have no translator at our company"). A sequence > of steps is not determinable.
In this case you can't be sure what would be worse, a poor translation or an indeterminable sequence in pictorial representation. :-) > Do you diconnect your docking station from the usb port each time? > Why is the HD removable also then? As I understand it, USB devices are hot-pluggable (as long as their filesystem is not mounted at the time). Hard drives on the other hand may or may not be hot swappable. SCSI drives on servers are usually hot swappable, with staggered pins on their plugs to allow ground and data connections to take place before the power pins apply power to the drive. Fibrechannel drives can be plugged in and out all day long. Your vanilla SATA drive on a PC is unlikely to be hot swappable. I would think the SATA HD on the docking station is unlikely to be hot swappable, unless specifically advertised as such. > I would expect that the docking station is triggering an enumeration > of its device each time the docking station is powered up with a > HD inserted...and not only if the USB plug is attached to the > computer.... > > Cheers! > mcc I don't really now how PCIe to USB adapters work, but I would think they have a controller onboard which converts one electrical signal to the other and a USB microcontroller which takes care of USB protocol transactions with the PC.
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