Hi all. Since I just upgrade to the latest version of W10, the 1607, I have a little problem with my 2 external hard drives USB 3 Samsung M3 Storage (2 TB) and La Cie Rugged (500 GB). They are detected (sound) but then they appear every 2 as RAW format in Disk Manager. A classic USB meets no problem. - From the Explorer, selection of the disc gives the message ' X: is not accessible. This request is not supported ' - I did a chkdsk X: /f and no error appears after the analysis. the drive was seen as NTFS - I tested on a USB 2 port, the discs are unreadable also. - I tested on a pc with the previous version (1511) and here, they are perfectly readable. - Same with a PC running w7 problem of drivers in the W10 1607 upgrade? The only working solution I find was to reformat (fast) the disk (I tried that with La Cie 500 GB). Then it becomes readable without problem. But the solution is not satisfante if it is necessary to save (for example 2 TB) the disk on another system and drive before formatting. Thanks for your help.