secondary storage;

Secondary Storage

http://saypoint.blogspot.com/2011/02/secondary-storage-device-in-pc.html

http://en.wikipedia.org/wiki/Computer_data_storage

http://searchstorage.techtarget.com/definition/secondary-auxiliary-storage

USB

http://en.wikipedia.org/wiki/USB_flash_drive

http://www.usb4ever.com/usb/usb-flash-drive--advantages-and-limits.html

http://www.ehow.com/list_5860311_disadvantages-usb-flash-drive.html

Floppy Disk

http://en.wikipedia.org/wiki/Floppy_disk

http://www.webopedia.com/TERM/F/floppy_disk.html

http://www.ehow.com/list_7413882_advantages-floppy-discs.html

http://www.wong-sir.com/cit/information_processing/floppy_disk.htm

Blu-ray

http://en.wikipedia.org/wiki/Blu-ray_Disc

http://www.blu-ray.com/info/

http://www.ehow.com/list_6644477_advantages-disadvantages-blu-ray-disk.html

http://www.gizmocafe.com/tv-video/guide-blu-ray-pros.aspx

http://www.gizmocafe.com/tv-video/guide-blu-ray-cons.aspx

Magnetic Tape

http://en.wikipedia.org/wiki/Magnetic_tape_data_storage

http://www.ehow.com/list_6633025_advantages-disadvantages-magnetic-tapes.html

http://www.ehow.com/info_8753639_advantages-disadvantages-cassettes.html

Paper Tape

http://en.wikipedia.org/wiki/Punched_tape

RAM Disks

http://en.wikipedia.org/wiki/RAM_disk

http://www.webopedia.com/TERM/R/RAM_disk.html

http://www.speedguide.net/articles/ramdisk-guide-131

http://lennartb.home.xs4all.nl/bootloaders/node5.html

http://www.clarkwood.com/old/rambunctious_os9/glossary.html

Zip Drives

http://searchmobilecomputing.techtarget.com/definition/Zip-drive

http://www.wisegeek.com/what-is-a-zip-drive.htm

http://en.wikipedia.org/wiki/Zip_drive

http://uk.answers.yahoo.com/question/index?qid=20080915000812AAsJkUv

http://wiki.answers.com/Q/What_are_the_advantages_and_disadvantages_of_a_zip_drive

How it works

http://www.buzzle.com/articles/how-does-a-flash-drive-work.html

http://www.ehow.com/how-does_4605435_usb-work.html

Future Directions

http://www.blue-cloner.com/resource/ongoing-development.html