A Magnetic Head is mounted in HDD to read and write data from disk.
The Magnetic Head is flying on the disk very closely (several nanometer).
High accuracy flatness and surface roughness are required for Lapping Machine.
Moreover, it is necessary to process the height of Reader and Writer element with high accuracy.
This machine makes the High Accuracy Lapping possible, so height of Reader and Writer elements can be lapped in nanometers.