Peek- is to look at something quickly, taking a glance If you mean Peek feature in Windows 7 then it is a feature which shows you thumbnails of a window of an application in Windows 7.
a unit of information equal to one septillion (10^24) or, strictly, 2^80 bytes ^= Extended to the power
A unit of storing capacity. Sequence=> Bit =>4 Bits or Nibble => Byte => Kilo Byte (KB) => Mega Byte (MB) => Giga Byte (GB) => Tera Byte (TB) => Peta Byte (PB) => Exa Byte (EB) => Zetta Byte (ZB) => Yotta Byte (YB) => Bronta Byte (BT) => Geopa Byte. Each differs with unit of 1024.