A similar calc with LTO-8 tapes comes out at 126PB per Model X. Not as dense, but the advantage is that tape robots and tape libraries go a little way towards automating the load/unload.
A Google search for “88.1 cu ft / 165mm^3 * 256GB” largely confirms your calculation (just over 3.8 XB of data). Can’t say I’m surprised - MicroSD cards really are crazy dense these days.
If it takes an hour to get to your destination (ignoring load/unload time), that’s an aggregate data rate of around 1000 TB (1 PB) per second. The entire Internet averages something like ~25 TB/s, so our Tesla X has the bandwidth of forty Internets.
Of course, there’s a downside: that many MicroSD cards would actually weigh around 3.7 tons (at 250mg apiece), which is heavier than the Model X itself! Might be harder than expected to make the drive itself.
Relevant XKCD (because there always must be one): https://what-if.xkcd.com/31/
Re:F*EX – Frams' Fast File EXchange
by AceJohnny2 on Friday June 01, 2018 @10:02PM
(#17212201)
I wonder if there have actually been 15M 256GB microSD cards even manufactured at this stage.
A microSD card is 165 mm^3 = 1.65e-7 m^3.
Dividing one by the other: 15090909 microSD cards could be put in the car [This is simultaneously probably unrealistically high due to the assumed ideal packing and also low due to the large amount of space left in the car].
256GB is the largest microSD card I can actually buy: This is gives us 3.8 exabytes of data hurtling down the highway.
How to efficiently load/unload this data is beyond me. (Short of magic wireless microSD).
V unira'g purpxrq nal bs guvf, V'z n ovg qehax.