The term removable cartridge usually refers to a type of hard disk that you can remove. Removable cartridges offer the speed of hard disks along with the portability of floppy disks.

(2) For laser and ink-jet printers, a toner cartridge is a metal container that holds the toner.

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Cartridges USA 
Contains online ordering for laser and ink-jet printer cartridges, copier toners, and fax cartridges. Also includes a laser and ink-jet printer FAQ, an overview of how laser printers work, proper equipment care techniques, information on toner cartridge remanufacturing, and links to downloadable drivers for many popular printers.

National Toner home page
This company provides recycled toner cartridges for laser printers, fax machines, and copiers. Their home page contains links to a product pricing summary, printing tips and an equipment cross reference list.

PC Magazine review of removable data cartridges
March 1996 PC Magazine review of removable data cartridge drives.

Toner and laser cartridge provider
Toner Cartridge City provides toner and laser cartridges, ink and deskjet supplies and office products. Their home page provides links to their products, manufacturers, and company and ordering information.

TonerPro
Online catalog and ordering site for toner and inket cartridges.