Limit on directory with many long filenames?

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Guest

I have a problem with a directory containing about 25000 data files having long names of around 25 characters. It will no longer accept any further files. If I rename one of the files, giving it a progressively longer name, there is a definite point beyond which it will not perform the rename. It seems like I have run into some system limit on directories. Does anyone have specific limits that might cause this

BTW, the directory is not the root directory and the file system is FAT32. The error message is "The directory or file cannot be created" (corresponding to system error 82: ERROR_CANNOT_MAKE).
 
Fat32 has a max of 65K entries. Long names chew at least two entries (and one for each 13 characters). NTFS has no folder limit and will take centuries to reach the disk limit.
 
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