SD card formatting

[Claude Buisson]

On 2020-03-15 22:39, Gary Aitken wrote:
> 11.3-RELEASE-p6 GENERIC  amd64
> 
> I'm having trouble reading SD cards formatted in my camera (Olympus 
> EM1-MkII)
> or on a Win 7 system.  When attempting to mount, I get the following:
> 
> $ mount -t msdosfs /dev/da0s1 /mnt/memstick
> mount_msdosfs: /dev/da0s1: Invalid argument
> $ mount -t ntfs /dev/da0s1 /mnt/memstick
> mount: /dev/da0s1: Operation not supported by device
> 
> Cards used without formatting *usually* seem to work.
> 
> If I look at the cards which don't mount using gpart, I see:
> 
> Card formatted in camera:
> $ gpart show -p /dev/da0
> =>       63  120944577    da0  MBR  (58G)
>           63      32705         - free -  (16M)
>        32768  120911872  da0s1  ntfs  [active]  (58G)
> $ gpart show -r /dev/da0
> =>       63  120944577  da0  MBR  (58G)
>           63      32705       - free -  (16M)
>        32768  120911872    1  7  [active]  (58G)
> 
> If I look at cards that I know I can mount I see the following:
> 
> $ gpart show -p da0
> =>      63  30375873    da0  MBR  (14G)
>          63      8129         - free -  (4.0M)
>        8192  15118336  da0s1  fat32lba  (7.2G)
>    15126528  15249408         - free -  (7.3G)
> $ gpart show -r /dev/da0
> =>      63  30375873  da0  MBR  (14G)
>          63      8129       - free -  (4.0M)
>        8192  15118336    1  12  (7.2G)
>    15126528  15249408       - free -  (7.3G)
> 
> or:
> 
> $ gpart show -p /dev/da0
> =>       1  15633407    da0  MBR  (7.5G)
>           1        31         - free -  (16K)
>          32  15633376  da0s1  fat32  (7.5G)
> $ gpart show -r /dev/da0
> =>       1  15633407  da0  MBR  (7.5G)
>           1        31       - free -  (16K)
>          32  15633376    1  11  (7.5G)
> 
> I tried reformatting as follows:
> 
> # gpart delete -i 1 da0
> da0s1 deleted
> # gpart add -i 1 -a 4M -t "\!11" da0
> da0s1 added
> # gpart show -r da0
> =>       63  120944577  da0  MBR  (58G)
>           63       8129       - free -  (4.0M)
>         8192  120930304    1  11  (58G)
>    120938496       6144       - free -  (3.0M)
> # newfs_msdos -F 32 /dev/da0s1
> /dev/da0s1: 120900736 sectors in 1889074 FAT32 clusters (32768 
> bytes/cluster)
> BytesPerSec=512 SecPerClust=64 ResSectors=32 FATs=2 Media=0xf0 
> SecPerTrack=63 Heads=255 HiddenSecs=0 HugeSectors=120930304 
> FATsecs=14759 RootCluster=2 FSInfo=1 Backup=2
> 
> If I put this card in the camera, I get an error ("Card Error")
> If I again format the card in the camera, I can't mount it.
> 
> I need to reformat these cards so I can use them in the camera and on
> freebsd, and apparently neither the camera nor win7 does that, so...
> What's the right way to lay out, format, and create a file system on an
> SD card so it is usable by cameras and windoze?
> 
> Thanks,
> 
> Gary
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Your card with a capacity > 32GB must be formatted as exFAT

The partition type seen by gpart is the same as NTFS

man gpart
  ...
  ntfs      A partition that contains a NTFS or exFAT filesystem

see also Bug 244461

CBu