'unallocated' originates from the prefix 'un-' meaning 'not' and the verb 'allocate', which comes from Latin 'allocare', where 'ad-' meant 'to' and 'locare' meant 'to place'.

'allocare' transformed into the French word 'allouer', and eventually became the modern English word 'allocate' through Middle English.

Initially, 'allocate' meant 'to place or assign', and 'unallocated' has retained the meaning of 'not placed or assigned'.