I stupidly changed my new SD cards file system to NTFS for using with my laptops and my Android tablet. Now I realize my tablet doesn't want to see the card when I put it in. And now I bought 2 USB's and notice they have FAT32 file system on them.
Which file system will work for each storage and will be compatible with all my devices?
On Android I would use exFAT, it has fewer limits and is supported to read and write by most platforms including Linux, Android, Osx and obviously Windows. You might need a couple of lines of commands on linux, not a big deal.
For Linux users:
apt(or yum) install fuse exfat-utils
Some desktop environments might have exFAT support by default though.
Fat32 and Fat64 are used for microSDHC and MicroSDXC cards, which are normally the ones used in mobile devices such as phones or tablets. So either fat32 or fat64 will work for your tablet. Fat32 is fine for the usb as well