exfat on SD card getting mounted read-only

[jd1008]

On 08/25/2014 05:58 PM, Tod Merley wrote:
> well does seem to be a common thread:
>
> https://www.google.com/search?q=sd+card+will+mount+only+read+only+fedora+20&oq=sd+card+will+mount+only+read+only+fedora+20&aqs=chrome..69i57.16787j0j7&sourceid=chrome&es_sm=93&ie=UTF-8 
>
>
>  - would love to see what we do find.
>
> Could you post the mount part of your dmesg (in a terminal "dmesg | 
> tail -n 30" and look for a segment similar to the last of this which 
> shows first a USB flash drive then an SD card using a USB card reader:
>
> [ 2324.410311] usb-storage 4-4.2:1.0: USB Mass Storage device detected
> [ 2324.410521] scsi10 : usb-storage 4-4.2:1.0
> [ 2325.477674] scsi 10:0:0:0: Direct-Access     Kingston DataTraveler 
> 3.0 PMAP PQ: 0 ANSI: 6
> [ 2325.478327] sd 10:0:0:0: Attached scsi generic sg5 type 0
> [ 2326.057398] sd 10:0:0:0: [sde] 61440000 512-byte logical blocks: 
> (31.4 GB/29.2 GiB)
> [ 2326.063433] sd 10:0:0:0: [sde] Write Protect is off
> [ 2326.063445] sd 10:0:0:0: [sde] Mode Sense: 23 00 00 00
> [ 2326.069441] sd 10:0:0:0: [sde] No Caching mode page found
> [ 2326.069453] sd 10:0:0:0: [sde] Assuming drive cache: write through
> [ 2326.105490] sd 10:0:0:0: [sde] No Caching mode page found
> [ 2326.105501] sd 10:0:0:0: [sde] Assuming drive cache: write through
> [ 2326.163558]  sde: sde1 sde2 sde3 sde4 < sde5 >
> [ 2326.197620] sd 10:0:0:0: [sde] No Caching mode page found
> [ 2326.197630] sd 10:0:0:0: [sde] Assuming drive cache: write through
> [ 2326.197639] sd 10:0:0:0: [sde] Attached SCSI removable disk
> [ 2330.331430] EXT4-fs (sde2): mounted filesystem with ordered data 
> mode. Opts: (null)
> [ 2330.342313] EXT4-fs (sde5): mounted filesystem with ordered data 
> mode. Opts: (null)
> [ 2682.408285] sde: detected capacity change from 31457280000 to 0
> [ 2687.133326] usb 4-4.2: USB disconnect, device number 6
> [42624.370736] sd 9:0:0:0: [sdd] 61407232 512-byte logical blocks: 
> (31.4 GB/29.2 GiB)
> [42624.390790] sd 9:0:0:0: [sdd] No Caching mode page found
> [42624.390806] sd 9:0:0:0: [sdd] Assuming drive cache: write through
> [42624.430844] sd 9:0:0:0: [sdd] No Caching mode page found
> [42624.430858] sd 9:0:0:0: [sdd] Assuming drive cache: write through
> [42624.440864]  sdd: sdd1
>
> Also it would be interesting to see what happens in a terminal tab 
> where a "journalctl -f" has been opened and is following what happens 
> as the card is mounted.
>

Here is what happens:

[20673.251583] mmc0: card e624 removed
[20689.837805] mmc0: new high speed SDHC card at address e624
[20689.839545] mmcblk0: mmc0:e624 SU16G 14.8 GiB (ro)
[20689.870081]  mmcblk0: p1

However, dmesg does not show any FS type info, but I had formatted as 
exfat, and is automounted upon insertion:

# mount
...
/dev/mmcblk0p1 on /run/media/jd/3D90-BEAB type fuseblk 
(ro,nosuid,nodev,relatime,user_id=0,group_id=0,allow_other,blksize=4096)