SD to USB adapter: No medium found

Question

Hi,
i have a new micro-SD to USB adapter but i doesn't work properly.
Output of dmesg when i insert the USB adapter:
$ dmesg
scsi 7:0:0:0: Direct-Access Generic STORAGE DEVICE 0272 PQ: 0 ANSI: 0
sd 7:0:0:0: [sdb] Attached SCSI removable disk
In /dev there is just sdb and no partitions although the micro-SD card has already a partition (just one). If i use the micro-SD card in the SD card slot this works properly:
$ dmesg
mmc0: new SDHC card at address 1234
mmcblk0: mmc0:1234 SA16G 14.6 GiB
mmcblk0: p1
So there must be a problem with the USB adapter.
Here just a few more information:
$ lsusb
Bus 002 Device 008: ID 05e3:0736 Genesys Logic, Inc. microSD Reader/Writer
$ fdisk /dev/sdb
fdisk: cannot open /dev/sdb: No medium found
But there is a medium and this medium already has a partition.
I already searched for the "No medium found" error but i could not find a solution. Does anybody has an idea of what is going wrong?
Best Regards
Werzi2001

Answer 1

I had very similar or even the same problem some time ago. 
Have you recompiled the kernel on your own?
If yes - maybe you forgot to select following option: CONFIG_SCSI_MULTI_LUN?
In my case without this option kernel allocated only one device in /dev/ (sdb, or so on), but with this option the kernel registers 4 block devices: sdb, sdc, sdd and sde. The connected micro-SD card will be accessible in one of those devices.
If this is a standard kernel from Arch distribution you may check it with:
zcat /proc/config.gz | grep CONFIG_SCSI_MULTI_LUN
Last edited by wtx (2015-03-23 15:56:30)