Nuts, I levelled the 1tb sd card, expanded and started moving files over manually. Will try that command on the 512gb card anyway
Thanks
Edit - Ran and it didnt find any issues
The type of the file system is exFAT.
Volume Serial Number is 8408-475F
Windows is verifying files and folders...
Volume label is RPMini.
File and folder verification is complete.
Windows has scanned the file system and found no problems.
No further action is required.
500629504 KB total disk space.
498631680 KB in 10046 files.
76032 KB in 587 indexes.
0 KB in bad sectors.
640 KB in use by the system.
1921152 KB available on disk.
131072 bytes in each allocation unit.
3911168 total allocation units on disk.
15009 allocation units available on disk.