Standard HDDs are notable for their construction. The enclosure conceals a mechanism with moving platters accompanied by hard disk heads that facilitate reading and writing of data. These moving parts are not particularly resistant against shock or impact, but on the upside, this design also delivers an affordable price tag and high storage capacity. File access speed and overall stability is also affected by the disk buffer - the so-called cache. The Seagate hard drive features a 256 MB cache that stores the last used data for their fast retrieval and reading.