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