A Chromebook supports different external storage devices including hard drives, USB flash memory, and micro SD cards. These external storage devices can be used to expand the small storage space on a Chromebook and transfer files between a Chromebook and other devices including Mac and Windows computers. The Chrome operating system supports file systems like FAT32, FAT16, exFAT, and NTFS. It can also read the Mac HFS+ file system but cannot write on it. Chromebook can read ISO9660 and UDF files on disc and also support MTP protocol for external disc drives that connect to USB, digital cameras, and music players. When you connect an external device to a Chromebook for the first time, it will automatically format that drive to exFAT. You can format your storage device to exFAT or let Chromebook do it automatically for you.