Jay is looking for an external hard drive that will go with a Mac. Leo says any external hard drive will work, so it doesn't matter. Will a portable drive last longer? Leo says no. It'll be a smaller drive, but the only difference will be that it would be powered by USB (bus powered). USB 3 would be ideal. It may be a bit slower, but that's about it. Leo says if it's for a desktop, then get an AC powered hard drive. They're faster and cheaper.