platter

Concise Oxford English Dictionary © 2008 Oxford University Press:
platter/ˈplatə(r)/

▶noun

• 1 a large flat serving dish.

  ■ a meal or selection of food placed on a platter.

• 2 the rotating metal disc forming the turntable of a record player.

  ■ informal, dated a gramophone record.

  ■ Computing a rigid rotating disk on which data is stored in a disk drive; a hard disk.

– phrases
on a (silver) platter informal indicating that something is achieved with little or no effort.

– origin ME: from Anglo-Norman Fr. plater, from plat (see plate).