Hello Andrew, thanks for your reply. Here is the output from dumpexfat:

    Volume serial number      0x61613331
    FS version                       1.0
    Sector size                      512
    Cluster size                  131072
    Sectors count              124702720
    Clusters count                486992
    First sector                   32768
    FAT first sector               16384
    FAT sectors count              16384
    First cluster sector           32768
    Root directory cluster             4
    Volume state                  0x0002
    FATs count                         1
    Drive number                    0x80
    Allocated space                 100%

The card content was the usual Panasonic directory structure with JPEG
files in subdirectories of DCIM; when a subdirectory reaches 1000 files
a new one is created. I restored my pictures with testdisk, so I can
tell there were 7069 pictures in 8 directories – but that includes those
that I had deleted and which were partly also restored by testdisk.

Here is the directory structure; I think I had deleted 124_PANA,
125_PANA, and 126_PANA but am not exactly sure:

 - AD_LUMIX
   - GPSDATA.DAT
   - GPSDATA20171027.DAT
 - DCIM
   - 124_PANA (642 pictures restored)
   - 125_PANA (993 pictures restored)
   - 126_PANA (998 pictures restored)
   - 127_PANA (993 pictures)
   - 128_PANA (997 pictures)
   - 129_PANA (996 pictures)
   - 130_PANA (998 pictures)
   - 131_PANA (452 pictures)
 - MISC  (empty, not restored)
 - PRIVATE (Panasonic proprietary data)

I suppose that the deleted 124_PANA also had contained almost 1000
pictures but that many could not  be restored because their space had
been used to store new pictures.

Anything else I can do?

-- Renardo

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Title:
  "Error: bad cluster 0xc0000000" on exfat SD card

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