external HD

[Basil Chupin]

On 22/01/13 02:44, Errol Sapir wrote:
> mmm.... Problem solved :-[
> It appears that the particular usb port in the computer is 
> malfunctioning. I tried the HD in another port and it works.
> To answer your questions. I did safely remove the HD and I also 
> started the computer several times. Nothing helped until I removed my 
> printer from its USB connection and conected the HD to that port.
> Thanks for the help.
> Errol
> On 01/21/2013 10:31 AM, Basil Chupin wrote:
>> On 21/01/13 19:06, TuxMario DeTreb wrote:
>>>
>>> Le 21/01/2013 06:26, Basil Chupin a écrit :
>>>> On 21/01/13 15:51, Errol Sapir wrote:
>>>>> I backup on a Toshiba external HD. Suddenly Kubuntu doesn't read 
>>>>> or recognize the fact that I place an external HD in the USB. I 
>>>>> tried even connecting it to the "direct" USB at the back of the 
>>>>> computer instead of to the front one which I always used. The HD 
>>>>> is recognized when I boot to windows. I am using Kubuntu 12.10.
>>>>> Any suggestions?
>>>>> TIA
>>>>> Errol
>>>>
>>>> Did you "Safely Remove" it when you used it last in whatever OS you 
>>>> used it in?
>>>>
>>>> And when you say that Windows "recognises" it, can Windows actually 
>>>> read the contents of the drive? (I am assuming here that the HDD is 
>>>> formatted in some weird Windows file system, right? :-) .)
>>>>
>>>> BC
>>>>
>>> Hello
>>>
>>> I had some times issues with USB port when one unmounting USB set 
>>> was not correctly done.
>>>
>>>   * t
>>>   * another one is to complete umount process by  commands
>>>
>>
>> Depends on what you actually mean by "reboot" - issuing the "reboot" 
>> command or merely hitting the "reset"/"reboot" button.
>>
>> Data is not always immediately written to a device but is stored in 
>> RAM or the HDD cache and is
>> waiting to be written to the device. With externals and USB flash 
>> sticks when the data IS written to them then a flag is set on that 
>> device indicating that there is no data yet to be written to it.
>>
>> If you do a normal "reboot" or "shutdown" the operating system makes 
>> sure that any unwritten data is written out to the appropriate device 
>> - and then the flag is set.
>>
>> If you suffer a power loss or hit the "reset/reboot" button this does 
>> not happen - and the flag is not set, indicating that there is 
>> missing data which is yet to be written to the device.
>>
>> So, be careful when you say, "Simpler solution was a reboot" :-) .
>>
>> Unmounting the device is the same as doing a correct reboot or Safely 
>> Remove the device - any unwritten data is written out to the device.
>>
>> Having said all of this, I know that when I was running Windows and 
>> shut the system down without first Safely Removing the USB or the 
>> external device I quite often ended up with problems. Moral of this 
>> is: Safely Remove such devices when you need them.
>>
>> BC

Now THAT is a most unusual situation. I have never heard of an USB port 
failing. Was it the cable or is the mobo on its last legs?

BC

-- 
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