Sometimes you’ll see a great deal on a external hard drive, but pass on it because it’s labeled “for PC” and you are on a Mac.
These drives will work on Macs too, you just have to re-format them.
What they mean when they say “for PC” is that it’s been pre-formatted from the factory to work with a PC with no additional configuration. Since most users aren’t IT people, that’s makes life easy for them. But all us Mac users have to do is use the Disk Utilities application to reformat that drive to Mac format and it will work exactly the same as a drive sold as “for Mac and PC.”
If you are not familiar with the Disk Utilities application, take some time and get to know it. It’s one of the basic tools you need to master to manage your storage. It’s a “dangerous” tool because you can completely erase disks, but no more dangerous than how you format memory cards in your camera. Just like formatting your memory cards, it’s a basic skill you need to master. So practice with it next time you have a new drive with no data on it, and always take your time to think things through.