Understanding journal log when USB stick inserted (recover dead USB stick)

I have an USB stick which can't be mounted anymore. In fact it is worse since it doesn't appear in Disk Utility. Nevertheless, it seems to be detected as an USB device but not as a storage device... Here are the logs from the Console app which contains USB in it:

error	20:13:28.917730+0200	kernel	AppleUSBXHCIDevice: AppleUSBXHCIDevice::transferEvent: no endpoint 1 for event 0x0000000000200d00 1b000000 0e018001
default	20:13:28.920350+0200	kernel	HS08@14300000: AppleUSBHostPort::enumerateDeviceComplete_block_invoke: enumerated 0xffff/1201/0000 (IOUSBHostDevice / 14) at 480 Mbps
error	20:13:28.920366+0200	kernel	AppleUSBLegacyRoot@(null): AppleUSBLegacyRoot::usbServiceCallback: controller  (XHC1) usbServiceArray (count 1) options 0x00000000
error	20:13:28.920371+0200	kernel	AppleUSBLegacyRoot@(null): AppleUSBLegacyRoot::usbServiceCallback:  
error	20:13:28.920372+0200	kernel	AppleUSBLegacyRoot@(null): AppleUSBLegacyRoot::usbServiceCall: controller  (XHC1) usbService  (IOUSBHostDevice) options 0x00000000
error	20:13:28.920388+0200	kernel	AppleUSBLegacyRoot@(null): AppleUSBLegacyRoot::getOrCreateLegacyControllerGated: located existing AppleUSBController@14000000
error	20:13:28.920392+0200	kernel	AppleUSBLegacyRoot@(null): AppleUSBLegacyRoot::usbServiceCallGated: IOUSBHostDevice  (IOUSBHostDevice)
error	20:13:28.920402+0200	kernel	AppleUSBLegacyRoot@(null): AppleUSBLegacyRoot::addDeviceToUsbPlane:
error	20:13:28.920658+0200	kernel	AppleUSBLegacyRoot@(null): AppleUSBLegacyRoot::usbServiceCall: usbServiceCallbackGated completed with 0x00000000 and service 
error	20:13:28.920665+0200	kernel	AppleUSBLegacyRoot@(null): AppleUSBLegacyRoot::usbServiceCall: registering IOUSBHostDevice@14300000 () for matching
default	20:13:28.982536+0200	kernel	IOUSBHostDevice@14300000: IOUSBHostDevice::setConfigurationGated: AppleUSBHostCompositeDevice selected configuration 1
error	20:13:28.982693+0200	kernel	AppleUSBLegacyRoot@(null): AppleUSBLegacyRoot::usbServiceCallback: controller  (XHC1) usbServiceArray (count 1) options 0x00000000
error	20:13:28.982698+0200	kernel	AppleUSBLegacyRoot@(null): AppleUSBLegacyRoot::usbServiceCallback:  
error	20:13:28.982702+0200	kernel	AppleUSBLegacyRoot@(null): AppleUSBLegacyRoot::usbServiceCall: controller  (XHC1) usbService  (IOUSBHostInterface) options 0x00000000
error	20:13:28.982990+0200	kernel	AppleUSBLegacyRoot@(null): AppleUSBLegacyRoot::getOrCreateLegacyControllerGated: located existing AppleUSBController@14000000
error	20:13:28.983000+0200	kernel	AppleUSBLegacyRoot@(null): AppleUSBLegacyRoot::usbServiceCallGated: IOUSBHostInterface  (IOUSBHostInterface)
default	20:13:28.983040+0200	kernel	USBMSC Identifier (non-unique): 0xffff 0x1201 0x0
error	20:13:28.983302+0200	kernel	AppleUSBLegacyRoot@(null): AppleUSBLegacyRoot::usbServiceCall: usbServiceCallbackGated completed with 0x00000000 and service 
error	20:13:28.983412+0200	kernel	AppleUSBLegacyRoot@(null): AppleUSBLegacyRoot::usbServiceCall: registering AppleUSBInterface@0 () for matching
error	20:13:28.986315+0200	com.apple.ifdreader	Failed to find AppleUSBAlternateServiceRegistryID.
error	20:13:28.987839+0200	kernel	AppleUSBLegacyRoot@(null): AppleUSBLegacyRoot::getOrCreateLegacyControllerGated: located existing AppleUSBController@14000000
default	20:13:28.992888+0200	kernel	PMRD: kIOMessageSystemCapabilityChange to com.apple.iokit.IOUSBMassStorageDriver
default	20:13:29.082493+0200	icdd	               Added | 0x10000058 - [USB][     IOUSBHostDevice ] ( 0, 0, 0) @ 0x14300000 |
default	20:13:29.097088+0200	icdd	            Inferior | 0x10000059 - [USB][     IOUSBHostDevice ] ( 8, 6,50) @ 0x14300000 |
default	20:13:29.199131+0200	airportd	SC:  airportdProcessSystemConfigurationEvent: Processing 'State:/Network/Interface/en0/AirPort/SmartCCADesenseUSBPresence'

It tried to compare the logs from this USB stick and another working one. Here are the logs from a working USB stick:

error	20:21:12.618896+0200	kernel	AppleUSBXHCIDevice: AppleUSBXHCIDevice::transferEvent: no endpoint 1 for event 0x0000000000200000 1b000000 10018000
default	20:21:12.632163+0200	kernel	HS08@14300000: AppleUSBHostPort::enumerateDeviceComplete_block_invoke: enumerated 0x058f/6387/0105 (GOODRAM 2GB / 16) at 480 Mbps
error	20:21:12.632183+0200	kernel	AppleUSBLegacyRoot@(null): AppleUSBLegacyRoot::usbServiceCallback: controller  (XHC1) usbServiceArray (count 1) options 0x00000000
error	20:21:12.632186+0200	kernel	AppleUSBLegacyRoot@(null): AppleUSBLegacyRoot::usbServiceCallback:  
error	20:21:12.632189+0200	kernel	AppleUSBLegacyRoot@(null): AppleUSBLegacyRoot::usbServiceCall: controller  (XHC1) usbService  (GOODRAM 2GB) options 0x00000000
error	20:21:12.632204+0200	kernel	AppleUSBLegacyRoot@(null): AppleUSBLegacyRoot::getOrCreateLegacyControllerGated: located existing AppleUSBController@14000000
error	20:21:12.632206+0200	kernel	AppleUSBLegacyRoot@(null): AppleUSBLegacyRoot::usbServiceCallGated: IOUSBHostDevice  (GOODRAM 2GB)
error	20:21:12.632217+0200	kernel	AppleUSBLegacyRoot@(null): AppleUSBLegacyRoot::addDeviceToUsbPlane:
error	20:21:12.632565+0200	kernel	AppleUSBLegacyRoot@(null): AppleUSBLegacyRoot::usbServiceCall: usbServiceCallbackGated completed with 0x00000000 and service 
error	20:21:12.632575+0200	kernel	AppleUSBLegacyRoot@(null): AppleUSBLegacyRoot::usbServiceCall: registering GOODRAM 2GB@14300000 () for matching
default	20:21:12.701512+0200	kernel	GOODRAM 2GB@14300000: IOUSBHostDevice::setConfigurationGated: AppleUSBHostCompositeDevice selected configuration 1
error	20:21:12.701756+0200	kernel	AppleUSBLegacyRoot@(null): AppleUSBLegacyRoot::usbServiceCallback: controller  (XHC1) usbServiceArray (count 1) options 0x00000000
error	20:21:12.701764+0200	kernel	AppleUSBLegacyRoot@(null): AppleUSBLegacyRoot::usbServiceCallback:  
error	20:21:12.701772+0200	kernel	AppleUSBLegacyRoot@(null): AppleUSBLegacyRoot::usbServiceCall: controller  (XHC1) usbService  (IOUSBHostInterface) options 0x00000000
error	20:21:12.701792+0200	kernel	AppleUSBLegacyRoot@(null): AppleUSBLegacyRoot::getOrCreateLegacyControllerGated: located existing AppleUSBController@14000000
error	20:21:12.701797+0200	kernel	AppleUSBLegacyRoot@(null): AppleUSBLegacyRoot::usbServiceCallGated: IOUSBHostInterface  (IOUSBHostInterface)
default	20:21:12.701834+0200	kernel	USBMSC Identifier (non-unique): 15030356004103 0x58f 0x6387 0x105, 2
error	20:21:12.702518+0200	kernel	AppleUSBLegacyRoot@(null): AppleUSBLegacyRoot::usbServiceCall: usbServiceCallbackGated completed with 0x00000000 and service 
error	20:21:12.702550+0200	kernel	AppleUSBLegacyRoot@(null): AppleUSBLegacyRoot::usbServiceCall: registering AppleUSBInterface@0 () for matching
error	20:21:12.705179+0200	com.apple.ifdreader	Failed to find AppleUSBAlternateServiceRegistryID.
error	20:21:12.708615+0200	kernel	AppleUSBLegacyRoot@(null): AppleUSBLegacyRoot::getOrCreateLegacyControllerGated: located existing AppleUSBController@14000000
default	20:21:12.715265+0200	kernel	PMRD: kIOMessageSystemCapabilityChange to com.apple.iokit.IOUSBMassStorageDriver
default	20:21:12.833878+0200	icdd	               Added | 0x10000061 - [USB][         GOODRAM 2GB ] ( 0, 0, 0) @ 0x14300000 |
default	20:21:12.835072+0200	icdd	            Inferior | 0x10000062 - [USB][         GOODRAM 2GB ] ( 8, 6,50) @ 0x14300000 |
default	20:21:12.897186+0200	airportd	SC:  airportdProcessSystemConfigurationEvent: Processing 'State:/Network/Interface/en0/AirPort/SmartCCADesenseUSBPresence'
default	20:21:14.450107+0200	Finder	<<

Notice that the first 25 lines are the same (the names and the hex numbers are the only differences). Therefore there is no error message telling why it failed.. Do you have any idea of the health of this USB stick according to the logs ? Is it only the flash part which is dead (because my computer and the stick seems to manage to talk in USB) ? Do you have any idea of how to recover it (maybe with a physical intervention) ?