Hard disk
Pigs, horses, cows, chickens, cocks, ducks (optional), donkeys (optional), sheep, goats, cats (optional), dogs (optional), bull, bunny (optional), turkey (optional).
no bond is not an optional money. A cheque can be a form of optional money.
The Logical Volume Manager (LVM) system allows management of volume groups (VGs), physical volumes (PVs), and logical volumes (LVs).
no, it is optional
The word problem was optional.
The opposite of compulsory (compelled) would be voluntary or optional.
The math question was optional, but every one did it.
The optional sacraments are Marriage, Ordination, and Unction.
The antonym of compulsory is optional or voluntary.
it is entirely optional
optional recovery number