Error message "Unable to determine file system type"

I tried to recover my SD card and got this message. Other recovery software I have tried easily finds all the files. Have I bought software that can't fix my card? Is there something else I can do. If I try to format the card won't I lose all my data.? Any help would be appreciated.

On 31/12/2019 at 17:30, raa1144 said:
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		I tried to recover my SD card and got this message. Other recovery software I have tried easily finds all the files. Have I bought software that can't fix my card? Is there something else I can do. If I try to format the card won't I lose all my data.?  Any help would be appreciated.
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I share your problem with my thumbdrive. windows says reformat. Recuva says it can't determine the file types, i.e. ntfs, etc. I fear reformatting will destroy all data. I don't have the answer but also need help to save my data.