https://bugzilla.kernel.org/show_bug.cgi?id=216282 --- Comment #3 from audioprof2001@xxxxxxxxx --- When you Turn-on the USB3.0 to SATA controller, electrons travel near the speed of light. Kernel interupts the CPU very fast, betwenn 1GHz and 2.8Ghz to detect & load drivers. BUT... the Mechanical HDD needs time to spin-up, when is turned-on, time to reach operating speed of 7200rpm, Large 3.5" HDD eat more than 3Amps at 12volts dc to spin-up. USB Mass Storage Needs a Delay, an interrupt wait to read from the controller, wait to initialize, until HDD had enough time to spin-up and read basic info, like Name, File system, etc... Like the Turtle vs. Rabbit Tale. ------------- $ sudo dmesg | grep usb [93862.823187] usb 2-2: new SuperSpeed USB device number 4 using xhci_hcd [93862.844103] usb 2-2: New USB device found, idVendor=174c, idProduct=5106, bcdDevice= 1.00 [93862.844109] usb 2-2: New USB device strings: Mfr=2, Product=3, SerialNumber=1 [93862.844111] usb 2-2: Product: BlacX [93862.844113] usb 2-2: Manufacturer: Thermaltake [93862.844114] usb 2-2: SerialNumber: 000000000002 [93862.881811] usb-storage 2-2:1.0: USB Mass Storage device detected [93862.881944] scsi host2: usb-storage 2-2:1.0 [93862.882037] usbcore: registered new interface driver usb-storage [93862.885157] usbcore: registered new interface driver uas [93887.950491] usb 2-2: reset SuperSpeed USB device number 4 using xhci_hcd [94392.705178] usb 2-2: USB disconnect, device number 4 [94397.329093] usb 2-4: new SuperSpeed USB device number 5 using xhci_hcd [94397.350234] usb 2-4: New USB device found, idVendor=174c, idProduct=5106, bcdDevice= 1.00 [94397.350246] usb 2-4: New USB device strings: Mfr=2, Product=3, SerialNumber=1 [94397.350252] usb 2-4: Product: BlacX [94397.350255] usb 2-4: Manufacturer: Thermaltake [94397.350259] usb 2-4: SerialNumber: 000000000002 [94397.353440] usb-storage 2-4:1.0: USB Mass Storage device detected [94397.353565] scsi host2: usb-storage 2-4:1.0 [94405.460664] usb 2-2: new SuperSpeed USB device number 6 using xhci_hcd [94405.481472] usb 2-2: New USB device found, idVendor=174c, idProduct=5106, bcdDevice= 1.00 [94405.481478] usb 2-2: New USB device strings: Mfr=2, Product=3, SerialNumber=1 [94405.481481] usb 2-2: Product: BlacX [94405.481483] usb 2-2: Manufacturer: Thermaltake [94405.481484] usb 2-2: SerialNumber: 000000000001 [94405.483318] usb-storage 2-2:1.0: USB Mass Storage device detected [94405.483606] scsi host3: usb-storage 2-2:1.0 [94845.006638] usb 2-2: USB disconnect, device number 6 [94857.034440] usb 2-4: USB disconnect, device number 5 [96252.135710] usb 2-2: new SuperSpeed USB device number 7 using xhci_hcd [96252.156665] usb 2-2: New USB device found, idVendor=174c, idProduct=5106, bcdDevice= 1.00 [96252.156679] usb 2-2: New USB device strings: Mfr=2, Product=3, SerialNumber=1 [96252.156685] usb 2-2: Product: BlacX [96252.156689] usb 2-2: Manufacturer: Thermaltake [96252.156693] usb 2-2: SerialNumber: 000000000001 [96252.160248] usb-storage 2-2:1.0: USB Mass Storage device detected [96252.160387] scsi host2: usb-storage 2-2:1.0 [96618.800360] usb 2-2: USB disconnect, device number 7 [96643.705966] usb 2-3.1: new SuperSpeed USB device number 8 using xhci_hcd [96643.726865] usb 2-3.1: New USB device found, idVendor=174c, idProduct=5106, bcdDevice= 1.00 [96643.726872] usb 2-3.1: New USB device strings: Mfr=2, Product=3, SerialNumber=1 [96643.726874] usb 2-3.1: Product: BlacX [96643.726876] usb 2-3.1: Manufacturer: Thermaltake [96643.726877] usb 2-3.1: SerialNumber: 000000000001 [96643.731430] usb-storage 2-3.1:1.0: USB Mass Storage device detected [96643.731717] scsi host2: usb-storage 2-3.1:1.0 [97775.098841] usb 2-3.1: USB disconnect, device number 8 [97789.264277] usb 1-1.4: USB disconnect, device number 14 [109374.033610] usb 2-4: new SuperSpeed USB device number 9 using xhci_hcd [109374.054547] usb 2-4: New USB device found, idVendor=174c, idProduct=5106, bcdDevice= 1.00 [109374.054561] usb 2-4: New USB device strings: Mfr=2, Product=3, SerialNumber=1 [109374.054567] usb 2-4: Product: BlacX [109374.054571] usb 2-4: Manufacturer: Thermaltake [109374.054575] usb 2-4: SerialNumber: 000000000002 [109374.056168] usb-storage 2-4:1.0: USB Mass Storage device detected [109374.056547] scsi host2: usb-storage 2-4:1.0 [109399.212614] usb 2-4: reset SuperSpeed USB device number 9 using xhci_hcd [109516.959732] usb 2-4: USB disconnect, device number 9 [109519.055610] usb 2-4: new SuperSpeed USB device number 10 using xhci_hcd [109519.076525] usb 2-4: New USB device found, idVendor=174c, idProduct=5106, bcdDevice= 1.00 [109519.076540] usb 2-4: New USB device strings: Mfr=2, Product=3, SerialNumber=1 [109519.076545] usb 2-4: Product: BlacX [109519.076550] usb 2-4: Manufacturer: Thermaltake [109519.076554] usb 2-4: SerialNumber: 000000000002 [109519.078216] usb-storage 2-4:1.0: USB Mass Storage device detected [109519.078505] scsi host2: usb-storage 2-4:1.0 -- You may reply to this email to add a comment. 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