Some laptops have limited storage:
• older laptops
• Chromebooks typically have only 8 or 16 GB of flash storage
• Apple’s MacBook Air starts at 128 GB of flash storage – older models had even less
Most obvious solution would be to replace the existing storage, but this can be expensive. Plus, some laptops, particularly the ultra-compact, such as the MacBook Air, are difficult to disassemble or modify.
Much simpler is to plug in a flash drive. A 128 GB flash drive would increase the storage in many Chromebooks by 800%. This would be OK in a desktop machine, but in a laptop on a lap, or dropped into a backpack, a typical flash drive sticking out of a USB port is an accident waiting to happen.
Brando have a flush fitting microSD adapter which fits in the SD slot. It’s aimed at MacBooks, but will probably work with other devices with SD card slots, depending on just how deep the slot is. Only $10.
Credit: The Gadgeteer
http://the-gadgeteer.com/2014/11/17/expand-your-macbook-pro-or-macbook-airs-file-storage-with-a-micro-sd-card/
Brando also have an almost flush fitting microSD to USB adapter that will work with any laptop:
Credit: The Gadgeteer
http://the-gadgeteer.com/2009/05/21/usb-microsd-card-reader-that-is-almost-microscopic/
http://usb.brando.com/usb-microsd-hc-card-reader-with-easy-eject_p00933c031d15.html
SanDisk Fit is a USB flash drive of similar physical size, & up to 64 GB capacity.
Credit: PC Mag
http://www.sandisk.com/products/usb/drives/cruzer-fit/
PKparis have a USB 3.0 flash drive of similar size.
http://gizmodo.com/youll-barely-notice-the-worlds-smallest-usb-3-0-flash-1446986913
Update 06 December 2014: Leef
Credit: Leef
Up to 64 GB.
http://www.leefco.com/supra-usb-3.0-flash-drive / MB/s tiny LED activity light lap top USB 3.0 port slot adding more file storage MacBook Pro MacBook Air external hard drive USB port USB flash drive insert inserting SD card dangling external drive mobile USB flash drives SD cards snagged MacBook Pro Air Micro SD HC card adapter adapter XC 64GB adapter turns MBP MBA SD card slot solid state flash drive Netbook Chromebook disc disk /