grub---problem

[Ralf Mardorf]

On Wed, 02 Dec 2015 12:18:50 +0100, Nils Kassube wrote:
>Ralf Mardorf wrote:
>> You do not get
>>   fdisk: cannot open /dev/sda: No such file or directory
>> and at the same time the output of parted -l shows sdb only and not
>> sda? That's just a rhetorical question. Please, next time post
>> everything.
>> 
>> I don't know, why there is no device sda, why the first device is
>> sdb.  
>
>I could think of two possibilities:
>
>1. Both drives are USB devices and sda is unplugged after some time.
>
>2. There is only sda, connected via USB. After a partition from sda is 
>mounted, the drive is replugged (*) and it becomes sdb because sda is 
>still in use (even though it is gone). This situation would also be 
>consistent with a previous mail where sda1 could be mounted but later 
>there was no device sda.
>
>(*) This might happen unintentionally due to a short power dropout of
>a bad power supply.

Indeed, one or more USB drives could explain it.