A:Answer The drive itself is compatible, but the filesystem may need to be changed. In your Applications folder, Utilities folder, open Disk Utility. In the left column, click the drive name, something like SanDisk 64 GB or similar. Check the bottom of the page to determine the current format. Might be NTFS or FAT32. If it's NTFS, I suggest reformatting the drive. NTFS on Mac is supported READ only. Meaning you won't be able to write files from your Mac to this drive without a special utility or some unsupported tech wizardry. If you don't need to use the drive with a PC or Linux, format the drive with GPT partition table and Mac OS HFS+ Journaled. Otherwise use GPT and FAT32 if you won't be using it for files greater than 4 GB in size. This gives you compatibility to read/write on Windows, Mac, and Linux. Further help with the reformatting process may be found online or from your favorite Mac tech person.