The point of write-once is for archival storage, though if it's magnetic, you'd still have to take care of the media. 1GB in the form factor of a postage stamp (if they branch off of SD-card) is a far cry from a 700MB optical CD that has a far shorter shelf life than originally thought or designed for. Even 5 of these is smaller than a 4.7GB single layer DVD -- it's only when you get to a 9GB dual layer DVD or larger (Blu-Ray & HD-DVD, et al) that the data density turns around in optical's favor.
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The point of write-once is for archival storage, though if it's magnetic, you'd still have to take care of the media. 1GB in the form factor of a postage stamp (if they branch off of SD-card) is a far cry from a 700MB optical CD that has a far shorter shelf life than originally thought or designed for. Even 5 of these is smaller than a 4.7GB single layer DVD -- it's only when you get to a 9GB dual layer DVD or larger (Blu-Ray & HD-DVD, et al) that the data density turns around in optical's favor.