On Fri, 3 Jun 2016, Mike Stein wrote: > How many station wagons full of 9-track tapes would fit into a (20) > cigarette box filled with microSD cards?
Station wagon full of tapes = 51 GB Pack of stogies full of SD = 2816 GB It's not fair using 9-track tapes, but let's go with it. Let's consider the Ford Focus SE station wagon which has 95.7 cubic feet of passenger space and 35.2 cubic feet in the back with all the seats up. So, that's 130.9 ft^2 total. We'll keep the seats up so we can use them as pillars to strap down mounds of tapes. We don't want them sliding around, being damaged, or flying up and smacking the rear of our head. That volume probably includes the driver, but let's assume we can make up for the driver's volume by shifting some tapes to the top of the vehicle in a plastic tub and strapping them down. Also, screw having a passenger. This is a Fear and Loathing in Las Vegas style cross-country escape from the weasels kinda drive. Solo, baby. Now, let's consider a 9-track tape, at 3600 feet (longest one I could find), with a density of 6250 CPI. That should give us 220MB according to multiple sources, but hey, spot check me. Now that reel should be a 10.5" wide by 5/8" thick. If my math is right, that's 6.56 cubic inches. If I take the space in the wagon and try to get my units aligned, that means 1570.8 in^3. Thus, after division = 239 tapes (even!). So, @220MB that's 51.34GB. Now for the cigarette box. I'm going to assume you mean the dimensions of a *pack* of cigarettes, and since we are all really cool enlightened smoker-people, we don't smoke 100s. So, we'll go with the standard size. That's @ 6.51 cubic inches, methinks (2 1/8th wide x 3.5" tall x 7/8ths thick). A standard SD card is 32mm x 24mm x 1mm. Because of the dimensions of the cigarette box doesn't quite factor out to hold the SD cards perfectly square, you're not going to be able to pack it completely full. If my math is right, you could fit two columns in there with about a 1/4th inch of slack. You can, unfortunately, only get two rows stacked in there because you end up with about 16.6mm worth of slack at the top (about 5/8ths of an inch). Now, with the cigarette pack being 7/8ths thick (about 22mm), we can fit 22 SD cards in one stack and we can shoehorn four stacks in our pack. Yeah, the extra plastic is probably bigger than 1mm and it's going to bulge a bit, but that's cool. That means we can get 88 SD cards in there. Now, we smoke Marlboros, like freakin' John Wayne. Thus, we can't really afford the fancy schmancy 128G cards, plus we aren't sure if our destination drive can read that huge size card, so let's stick with cheap-az 32G cards. That's 2816 GB. So what did I screw up? :-) -Swift
