| http://www.w3.org/ns/prov#value | - There also exists PCMCIA memory cards which are small sized and fairly portable, but they can only be used on computers with slots for such cards. [0004] A problem with today portable discs is that they are easily damaged, and when so it is probable that all information stored on them is lost, which of course is a disaster for a user. [0005] Another problem consists in that known portable discs su
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