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Can't format SD card

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3 replies to this topic

#1 Izzye


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Posted 20 December 2015 - 01:07 PM

I bought myself a 64GiB Kingston class 10 SD card the other day, put it in my camera to see if it worked, which it did, so I forgot about it. Unfortunately I then forgot to take it out before using the camera and my computer spent yesterday running a file recovery programme because I hadn't formatted it. When it finished I tried to format it with the computer running XP but after a minute of trying it informed me I couldn't format it, formatted it through the camera, back in the computer, same error. Ran a virus scan to check there wasn't anything untoward happening on my computer, but I've just tried it on my laptop (Linux Peppermint) and when I try to mount it I get back this message;


Error mounting /dev/sdb1 at /media/izzye/LUMIX: Command-line `mount -t "exfat" -o "uhelper=udisks2,nodev,nosuid" "/dev/sdb1" "/media/izzye/LUMIX"' exited with non-zero exit status 32: mount: unknown filesystem type 'exfat'

Tried to access it through terminal but got back; 
fdisk /dev/sdb1
fdisk: unable to open /dev/sdb1: Permission denied


Anyone got any idea how to fix this?


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#2 JohnC_21


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Posted 20 December 2015 - 03:21 PM

I believe the issue is the exfat file system. Fat32 normally has a 32GB limit and it's necessary to use third party partition management to format Fat32 past 32GB. ExFat supports a partition over 32GB but it's possible your computer has trouble with it even though Windows should be able to mount the file system as read only. Linux can detect but not read ExFat.


See if your computer and camera can access a Fat32 partition of 64GB. Download and run Partition Wizard with the SD card attached to your computer. Delete any partitions currently on the SD card. Make sure you are doing this you your SD card and not your HDD. Create a Fat32 partition of 64GB and make it Primary. Does your camera recognize the full 64GB?


All steps in Partition Wizard are virtual. Nothing will be done until you click Apply. This lets you cancel an operation.


If you have experience with Gparted on linux you can format the SD card with it.

#3 Platypus


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Posted 20 December 2015 - 05:00 PM

I'd suggest trying the card in a current system, since older systems can have a hardware problem where the SD card reader doesn't understand SDHC (SD High Capacity), and if XP is not fully updated, it also may not understand exFat, although that would be an unusual situation.

If anyone you know has a laptop running Windows 7 or later, chances are it should handle both SDHC and exFat, and give you correct handling of the card. That would let you work out if there is actually any problem with the card, or if it's just the old XP system that's having trouble with it.
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#4 Bailifei


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Posted 21 December 2015 - 01:40 AM

Partition Wizard, Partition Manager, Partition Master, Partition Disk, seem all works in the same way.  :bubbles:

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