I used to think that (1024 vs 1000), but not any more. There's ancient precedent for the other interpretation.
For example, when I was a kid growing up in NY, one of the local radio stations I listened to was WPLJ, 95.5 MHz. That's 95,500,000 cycles per second, not 100,139,008.
Go back nearly 100 years, the Chicago area got a radio station called WLS[1], one of the original clear channel stations. It broadcasts at 870 KHz. That's 870,000 cycles per second, not 890,880.
Much as computer people would like "kilo", "mega", "giga" etc to mean 1024^(whatever), there's a lot of precedent for doing things the old fashioned way!
As Wikipedia explains:
tera-, from Greek word "terastios"="huge, enormous", a prefix in the SI system of units denoting 10^12, or 1 000 000 000 000
SI is a well accepted standard. Just because it's more logical for chip designers to implement memory chips using powers of 1024 isn't a good enough reason to ignore SI.
I would hardly call it old fashioned. SI prefixes were just mis-applied to storage sizes, hence the more correct use of kibibyte (kiB) [0], mebibyte (MiB), etc. Hence also Apple's somewhat recent switch to using 1 kB = 10^3 bytes.
