While this so far hasn't been a data-loss issue, It may become one,
since it doesn't only apply to USB flash drives, but also USB powered
laptop harddrive enclosures.
When unmounting my specific hard drive (WesternDigital Elements 250GB),
as well as the light remaining on, the HDD platters continue to spin
indefinitely. My only option is to unplug it while it's spinning. I'm
sure this isn't good for the drive.
On the other hand, I have the same issue in windows with particular
drive (disks continue spinning after being "safely removed"). It might
just be a badly designed drive (lsusb, below, says it's self-powered,
which is wrong), and in that case, powering it down would probably have
the same effect as simply unplugging it.
Bus 005 Device 021: ID 1058:1010 Western Digital Technologies, Inc.
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x1058 Western Digital Technologies, Inc.
idProduct 0x1010
bcdDevice 1.05
iManufacturer 1 Western Digital
iProduct 2 External HDD
iSerial 3 575845353038504A35393537
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 32
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
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 (Zip)
iInterface 0
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
--
USB memory stick light stays on after "safely remove" (KDE)
https://bugs.launchpad.net/bugs/90097
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