Sentence:  The first step to increasing your drive space is to add a new storage device. It can be a hard drive (IDE or SCSI), but also a USB or FireWire <WSD>memory stick</WSD>. 
Meaning of the word marked with <WSD> tags:  A portable solid-state electronic flash memory data storage device equipped with a USB (or similarly specified) plug for direct connection to a corresponding port; a USB drive, thumb drive or pen drive.