"kind" fakes show write errors when writing data. Evil fakes just return garbage data.
I have even witnessed a few fakes which understand a fat32 filesystem and make sure the filesystem data structures and the first and last few kilobytes of every file get mapped to working flash so that a chkdsk won't pick up issues and browsing the files shows no obvious issue. Many cameras store jpeg thumbnails, and the thumbnails continue to show too.
"kind" fakes show write errors when writing data. Evil fakes just return garbage data.
I have even witnessed a few fakes which understand a fat32 filesystem and make sure the filesystem data structures and the first and last few kilobytes of every file get mapped to working flash so that a chkdsk won't pick up issues and browsing the files shows no obvious issue. Many cameras store jpeg thumbnails, and the thumbnails continue to show too.