

If you intend to use the same drive on both platforms, you can install software on your Mac that will enable it to do both: NTFS-3G is a free option. OS X can read files on an NTFS drive, but it can’t write them.

Mac or PC: OS X and Windows use different file systems (HFS+ and NTFS, respectively), so most hard-drive manufacturers offer platform-specific models the drives are preformatted accordingly, and the bundled software (if any) is compatible with the given platform.

Before you can choose the right drive, however, you have to identify your needs, wants, and budget. Pay for that storage capacity once, and you’ll own it forever-and you can take it with you wherever you go. For less than $200, you can get a 2TB drive that supplies four times the capacity of a Dropbox account. If you need just storage, as opposed to a service for file syncing or collaborating via the cloud, buying a portable hard drive is far more economical. One solution might be to rent storage space in the cloud, but buying a hard-drive’s worth of capacity is prohibitively expensive: 500GB of storage on Dropbox, for example, will set you back $499 per year. And if your primary computer is a laptop or an all-in-one desktop, you won’t be able to solve the problem by opening the case and tossing in a supplemental drive. You can never have too much digital storage, and the day will come-sooner than you think-when you won’t be able to squeeze a single new file onto your computer’s hard drive.
