Unable to write to USB or simply caot use USB in 14.04

This command really helped me "sudo mount -o remount,rw,uid=[renju] /dev/sdb1 /media/renju/9F51-B46B".
After executing it, i restarted the machine and that did the trick.

Now the issue is with the pendrive that i tried to fix. When i tried to execute the same command for that,
this is what i got!

renju@renjus-notebook:/media/renju$ sudo mount -o remount,rw,uid=[renju] /dev/sdb1 /media/renju/0F9D-5117/
[sudo] password for renju:
mount: you must specify the filesystem type

using nautilus gave me this error messge.

Sorry, could not change the permissions of “0F9D-5117”: Error setting permissions: Read-only file system

result of chown

renju@renjus-notebook:/media/renju$ chown -R renju:renju 0F9D-5117/
chown: changing ownership of ‘0F9D-5117/SanDiskSecureAccessV2.0/DownloadForMac_SanDiskSecureAccessV2.0.pdf’: Read-only file system
chown: changing ownership of ‘0F9D-5117/SanDiskSecureAccessV2.0/QuickStartGuide_SanDiskSecureAccessV2.0.pdf’: Read-only file system
chown: changing ownership of ‘0F9D-5117/SanDiskSecureAccessV2.0’: Read-only file system
chown: changing ownership of ‘0F9D-5117/SanDiskSecureAccessV2_win.exe’: Read-only file system
chown: changing ownership of ‘0F9D-5117/Adi Kapyare Kootamani (2016) Malayalam DVDRip 720p x264 AAC 5.1 E-Subs-MBRHDRG.mkv’: Read-only file system
chown: changing ownership of ‘0F9D-5117/’: Read-only file system