An unexpected error occurred (error code -50)

Have anybody received this error "An unexpected error occurred (error code -50)"? I am using a harddrive (FAT) that I split in two partitions: 1st exclusive for time machine and the other as an extra drive for my photo library of the Light Room. Some times it worls well, another it doesn't allow to creat new folders or delete/move files, and show the message "An unexpected error occurred (error code -50)". I have formated and restart the use it twice, but the problem persist.
Can anybody help me???

Trimmed down the search terms [ error 50 site:support.apple.com -iTunes ]
Error (-50)
-50
paramErr
Error in user parameter list
from the archived article regarding OS 9 and earlier > Mac OS System Error Codes: 0 to -261 - Apple Support
ÇÇÇ

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