For me, running lsblk always shows mmcblk0 -- even when the SD card is not 
inserted; it's the eMMC.
Are you sure test.txt was actually on the SD card and not on the onboard 
eMMC storage?

On Thursday, March 2, 2017 at 4:14:47 PM UTC-5, Larry Nestor wrote:
>
> I am running bone-debian-8.7-lxqt-2gb-armhf-2017-02-12-2gb. I plugged my 
> sd card in a USB adapter in linux box. I ran gparted, removed all 
> partitions, and set up the sd card as all fat32. Shut it down and removed 
> usb from linux box, put the sd card in BBB running debian (while it was 
> running). Type 
> $lsblk, found the sd card as mmcblk0 and the first and only partiton on 
> card mmcblk0p1. This listed the entire card. Issue the mount command 
> $sudo mount /dev/mmcblk0p1 /media
> $cd /media
> $ sudo touch test.txt
> $ls 
> This showed test.txt is there. Not very complicated. 
>
> On Saturday, May 11, 2013 at 4:33:43 PM UTC-7, Trefor Delve wrote:
>>
>> All,
>>
>> Can someone point me in the right direction.
>>
>> I've updated the Beagle Black via the SD card, now I want to be able to 
>> use an blank SD card for extra storage. If I just format a card and put it 
>> in the slot, the four LEDs light up and that's it.
>>
>> What do I need to do to use a blank card and mount it.
>>
>> Many thanks,
>>
>> Trefor
>>
>

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