just pulled out my sd card for the satnav to install latest maps ect  plugged the card in to pc and got the error

 

you need to format the disk in drive : before you can use it .

 

wont read the sc card at all  so pulled the sd card with my mp3's out of the car same error

 

back in the car they are OK!

 

I can easily format my music card and reinstall the files

but want to make a back up of the satnav  in case something goes wrong  in the map up grade.

 

can any one help

 

 

 

What sat nav device?

That will help us give you advice.

Sorry its the Amundsen. in a Octavia 3

But this is also with the Sd card i have music on dug out a old reader  and pluged it in to  a laptop this also wouldent read the card

but again fine when back in the car >

Is the card a non-HC SD card larger than 2GB?

What size are the SD cards?  I bet if you borrow a newer laptop or card reader your cards will work fine. Older readers can only read older SD-cards but can't read the newer (but physically identical) higher capacity SDHC or SDXC cards . Likewise the older readers only support the FAT16 filesystem where newer devices support FAT32 and NTFS. Sometimes it can be fixed by updating the firmware on the card reader or software driver.

 

If you pull out an SDcard while it is being written to then it can trash the card - but given what you have described that doesn't appear to be the problem here.

one is the skoda  sd  with the maps on don't know what size

the other is a 64gb sdhc  card  the reader on my pc can/did read this one as that's what i used to copy my mp3s with