Each file format has its own characteristics that we will discuss below. The file formats are the facilitators that help the computer write data onto the hard drive. Part 2: Explaining the 3 most common file formats for Mac and PC As we discussed, the hard drive for Windows or Mac can be formatted in three different file formats. This means read/write speeds of about 120MB/s. It’s a standard hard disk drive with an RPM of just 5,400. For speeds, the real problem is the technology of the drive, though. For Mac users, you’ll need to reformat it, and there’s no USB 3.1 or Thunderbolt, just USB 2.0/3.0. When you take into account price, ease of use, and portability, the Seagate Backup Plus Slim is the most reliable hard drive you can carry around with you at all times. The best external hard drives for Mac are not only useful for storing data but are an excellent way to transport files from one location to another. Mac And Pc Compatible External Hard Drive.How To Format External Hard Drive For Pc And Mac.