Comment Re:stone tablets (Score 2) 251
You can't commit to
Besides, you commit to archive that which is important, not that which is fleeting or trivial. For most people that will be pictures. For some it will be video, and CD probably isn't the best format for video, admittedly.
I don't expect any media that requires a specific bus to be workable 40 years from now. That eliminates all hard disk drives right off the batt; who has an MFM or RLL controller? Who has an ISA bus to plug it into? Who even has traditional SCSI left working and how much longer will the standard 32-bit PCI interface be around? Good ol' fashioned 40-pin IDE is defunct, and I don't expect SATA and SAS to live any longer than it did. USB 3 is pinned differently than 1.1/2, so it's not inconceivable that future USB revisions might break backward compatibility with older revisions. Thunderbolt is based on a video connector that could sunset in much the same way that Firewire is basically gone now too.
Then you look at your solid-state media, the kind that require a reader. Several early formats like Smart Media and Memorystick are completely dead, XD is essentially dead, and only Compact Flash and SD-variants are strong at the moment. Thing is, both of those have had format revisions over the years, so it's also possible that early CF and SD won't work in later readers too. CF will be more dramatic since the early standards were based on the set of standards governing IDE and PCMCIA, and newer standards have changed that so they might not even interface. SD is less dramatic but filesystem changes through the years will pose problems even if there's a reader that can accept the unit and plug into a then-modern computer.
I don't even want to get into tape. Trying to find a Travan drive is already hard, and DAT is getting icky.
That leaves us to look at what's so popular as to likely never be completely inaccessible, aka the Compact Disc.