HHD doesn't really work with CDJ 850

Hi there, 

I have read a lot of posts and messages about HHDs problems with Cdjs 850 but my case is a little bit weird.... 

I bought  two Maxtor M3 portable 1to 2 months ago

All worked perfectly and I sadly lost one in a party. 

I was satisfied by the maxtor and decided to buy 2 more (1 to replace the lost one and another to be able to make time machine back-up). 

When I put the new one in the CDJ, a message "usb error" appeared. Even the error message I could enter the folder and played some tracks. I said "SOME" because some, well a lot of folders are "EMPTY" according to the CDJs....

(I switched off and switched on : some "EMPTY" folders were not anymore empty while other turned into EMPTY folders...)

I tried with the second new one and got the same problem. 

What is very surprising is that the hhd I bought 2 months ago worked perfectly (same brand and same model). 

I formated both hhd in FAT32, updated them with the last drivers, installed the last CDJ 850 firmware, tried on rekordbox with the last updated version (message error E 83 - 06)... 

I do not what to do anymore... Please if someone can help me :) 

Cheers, 

Lucas.