This is because when you initially connect an external HDD made for Mac (to a Mac computer), you won’t be required to format it before you begin transferring files. Key considerations Formattingįor Mac users, buying an external HDD already formatted for your system makes getting started much easier. There are varying levels of storage capacity in an external hard drive, and the overall size of the HDD depends on the model. Others will need to be plugged into the wall. Some external hard drives get power directly from the computer connection. Flash drives are external drives, but they aren’t as fast, and they don’t usually store as much space as their larger external hard drive relatives. flash drivesĮxternal hard drives are basically hard drives (HDD) or solid state drives (SSD) that are wrapped in their own protective casing and connect to your computer from the outside as opposed to the inside. There are hard drives that may hold volumes like 3TB, 6TB, and 10TB, but they are much less common than the standard hard drives that hold: 1TB, 2TB, 4TB, 8TB, and 18TB.
