disc or disk?

Use disc with a "c" when you are referring to optical media such as a CD or DVD. All discs are removable, meaning when you eject the disc from your desktop, it physically comes out of your computer. 

Use disk with a "k" for magnetic media, such as a floppy disk, the disk in your computer's hard drive, an external hard drive.


Use -ise endings, not -ize.

Follow British English for spelling.

Note: There are a small set of verbs in English which must always be spelled with -ise at the end and never with -ize. Here are the most common ones:

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