Re: smartctl cannot access my storage, need syntax help

[David Wright <deblis@lionunicorn.co.uk>]

On Tue 16 Jan 2024 at 06:08:35 (-0500), Felix Miata wrote:
> Tom Furie composed on 2024-01-16 08:18 (UTC):
> > Felix Miata writes:
> 
> >> /dev/sdc 18 /dev/disk/by-id/usb-Brother_MFC-J6920DW_BROG5F229909-0:0 #
> >> How does a printer get a storage device assignment???
> 
> > By having some kind of SD card slot or similar.
> 
> So this pollution only results from a USB-connected printer? IP printer
> connections don't cause it too?

AIUI (not very well), you only get a /dev/sdX when the linux kernel
is what's writing the blocks on the filesystem.

So when I plug in my Galaxy 4 mobile and tap the appropriate buttons
on its screen, /dev/sdb{,1} appear as a block device and partition:

  sdb           8:16   1  29.7G  0 disk  
  └─sdb1        8:17   1  29.7G  0 part  

so I can run fdisk on the SD card while in the phone, for example:

  $ sudo fdisk -l /dev/sdb
  Disk /dev/sdb: 29.72 GiB, 31914983424 bytes, 62333952 sectors
  Disk model: S5360 Card      
  Units: sectors of 1 * 512 = 512 bytes
  Sector size (logical/physical): 512 bytes / 512 bytes
  I/O size (minimum/optimal): 512 bytes / 512 bytes
  Disklabel type: dos
  Disk identifier: 0x03399e11

  Device     Boot Start      End  Sectors  Size Id Type
  /dev/sdb1        2048 62333951 62331904 29.7G  c W95 FAT32 (LBA)
  $ 

OTOH with my A13 phone, I don't get a block device created, but just
a FUSE wrapper round the filesystems that Android is running, both
internal and any SD card:

  $ mount
  [ … ]
  aft-mtp-mount on /media/samsungd type fuse.aft-mtp-mount (rw,nosuid,nodev,relatime,user_id=1000,group_id=1000)
  $ 

Cheers,
David.