Thank you .
On Sunday, 16 December 2018 15:28:08 IST Greg KH wrote:
> On Sun, Dec 16, 2018 at 01:09:48PM +0200, [email protected] wrote:
> > Hi,
> >
> > I got to a slight confusion about what is the correct way to safely
> > disconnect hdd sata over usb adapter with external power unit from
> > laptop running Linux (4.18).
> >
> > my current action list was :
> >
> > 1. unmount everything
>
> That's all you need to do.
>
> You can also issue a "power off" command to the drive now if you want to
> shut off the power to it (and the drive/controller actually support it).
Not knowing if said drive does or does not support it (hdparam -Y ) made me
go to the safest next choice. (sleep) man file says don't do it if you don't
know what you are doing (and I'm not).
> I know gnome-disks has that option and I use it all the time with my
> external sata USB controller.
>
> > 2. sync
>
> You could do that before unmount, but unmount will also do that for you.
> No need to do this afterward.
>
Thanks.
> > 3. hdpram -S 30 /dev/sdX (I'm not sure if does anything honestly because
> > device is connected over a sata to usb interface)
>
> What does this do? Why "sleep" the drive?
>
sleep have more chances to be implemented.
> > 4. Wait for ~20 minutes
>
> Huh? Why 20 minutes?
>
just to play safe.
> Just unmount and then power off the device, that should be sufficient.
>
> good luck!
>
> greg k-h
When I asked this morning , I had one dead drive, this afternoon I got another
that looks like a dead one (kernel does not enumerate it or even show a
connection ) .
I do not see any problem with pata (2.5") over usb (worked with two drives
that did not fail yet).
The drive that failed , had been the ones with sata connection but not with
an IDE connection.
When connected over PATA it is identified as
Bus 001 Device 029: ID 152d:2338 JMicron Technology Corp. / JMicron USA
Technology Corp. JM20337 Hi-Speed USB to SATA & PATA Combo Bridge
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x152d JMicron Technology Corp. / JMicron USA Technology
Corp.
idProduct 0x2338 JM20337 Hi-Speed USB to SATA & PATA Combo Bridge
bcdDevice 1.00
iManufacturer 1 JMicron
iProduct 2 USB to ATA/ATAPI bridge
iSerial 5
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 32
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 4 USB Mass Storage
bmAttributes 0xc0
Self Powered
MaxPower 2mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 8 Mass Storage
bInterfaceSubClass 6 SCSI
bInterfaceProtocol 80 Bulk-Only
iInterface 6 MSC Bulk-Only Transfer
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x02 EP 2 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Device Qualifier (for other device speed):
bLength 10
bDescriptorType 6
bcdUSB 2.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
bNumConfigurations 1
Device Status: 0x0001
Self Powered
for a PATA connection :
usb 1-1: new hih-speed USB device number 29 using xhci_hcd
usb 1-1: New USB device found, idVendor=152d, idProduct=2338, bcdDevice= 1.00
usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=5
usb 1-1: Product: USB to ATA/ATAPI bridge
usb 1-1: Manufacturer: JMicron
Sold under the brand name Gold-Touch sata to usb.
Either I had two faulty sata hard drives within one week ,two bad adaptors or
some nasty luck.
Thanks.
