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Open a file stored on Sony’s new pen-inspired Microvault by simply plugging it into the computer’s USB port. The device comes in four capacities — 16MB (yellow), 32MB (red), 64MB (blue), and 128MB (black) — though models with as much as 2GB of storage could be available within the next couple of years.

USB FLASH MEMORY

Great For: People with two or more unnetworked computers, or those who ferry files from home to work.

Think Twice If: Your files come from digital devices that require a specific type of memory card.

What to Buy: Sony Microvault ($49 for 16MB to $299 for 128MB), IBM Memory Key ($89 for 32MB), Agat Q ($69 for 16MB to $199 for 64MB).

PERSONAL HARD DRIVES

Great For: Data hogs (think 40GB), such as those who want to carry around their collection of MP3s.

Think Twice If: Size and weight concern you — they’re comparatively bulky.

What to Buy: Archos Technology MiniHD ($199), Apple iPod (at $399, it’s not just an MP3 player).

REMOVABLE FLASH MEMORY CARDS

Great For: People with many digital devices that require a specific card.

Think Twice If: You want to share your data with others.

What to Buy: Compact Flash card, Secure Digital card, Memory Stick, SmartMedia card — many options for all, starting at $18.