Assume v. Presume

[HugeMaximum]

https://en.wikipedia.org/wiki/Spelling_of_disc
Compact disc is spelled with a "c" because Philips and Sony officially trademarked the format with that spelling in 1979. Other optical discs also then got that spelling.
Any other computer disk should be spelled with 'k'.

 

[gomezz]

Similar confusion over program / programme. For me, the former is a computer program and the latter is a TV programme and also a programme of events for a concert or fete etc.

 

[prpr]

I never know which it is - disk or disc. With me it can vary from day to day.

It is correct as I stated. More of a problem is hard (or solid state) disk/drive.

they were also known as a diskette

Only to IBM. Everyone just called them "floppy/floppies" anyway.

 

[prpr]

the former is a computer program and the latter is a TV programme and also a programme of events

Correct. AFAIA, the only correct use of "program" is computer related. Everything else ends in ...mme.

 

[HugeMaximum]

Correct. AFAIA, the only correct use of "program" is computer related. Everything else ends in ...mme.

... in proper (British) English. Or is that English English?

 

[prpr]

I have no idea what you mean. English is just English, AFAIK. You don't need to qualify it unless it's some foreign thing, like American English etc.