Tom Walker wrote in a message to Jasen Betts:

->  MM> Neither, it's _the_ speed.  1X didn't have all the fancy speed
->  MM> controls we have today, just a plain flat 300 RPM

-> I've got a regular CD player here and it spins faster on the
-> first track of the CD than on the last track, by definition that's
-> 1x speed
-> and it's nothing fancy.

 TW>  And as I recall the Computer 1x CD drive did the same thing. It
 TW> maintained a constant data rate by changing the disk RPM. And the
 TW> 300 was the Average Speed for a 1x drive.

Maybe.  I read somewhere that there are CAV (constant angular velocity) and
CLV (constant linar velocity?) drives out there,  just to confuse us
further...

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