Dan's Data has checked out some USB and FireWire external drive boxes

But you don't want to have to buy and install a drive that can write them in multiple computers, and external 5.25 inch devices tend towards the transportable end of the portability spectrum - definition: Neither chained to a wall nor attached to an alarm system. And the larger capacity formats can't even be read by ordinary CD-ROM drives. And even the largest capacity writable DVD flavours can't hold as much data as the cheapest 3.5 inch commodity hard drives that your local computer shop's likely to stock.

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