The official warranty and maintenance services provided by Apple Inc., which is renowned for its avant-garde design and exquisite craftsmanship, are hard to measure in terms of value. For example, the seamless design of iPod Classic has made it impossible for many informal repair shops to carry out disassembly repairs. You can understand by looking at some online trading area posts selling iPhones that have been mistakenly repaired. For delicate devices, any repair or value-added services from non-official channels may result in unpredictable effects.