A technology used in music players to prevent music from playing irregularly when the player is jerkily moved. This was an important feature for CD and MiniDisc players because they contained moving parts, and the read heads could be easily shaken. Skip protection usually works by compressing data to a memory buffer and then reading from it. This might result in lower quality because of the data loss during compression and decompression, but the benefit is uninterrupted music. Hard drive based PMPs do employ this technology, but it is not an issue in Flash-based devices because they have no moving parts.