An analog hard disk drive (HDD) is a type of storage device that uses a spinning disk to store data. The data is written to the disk using a magnetic head, which reads and writes data to the surface of the disk.
There are three main methods of writing data to an analog HDD: longitudinal recording, perpendicular recording, and shingle recording.
Longitudinal recording: In longitudinal recording, the magnetic head writes data to the disk in a series of parallel tracks, similar to the grooves on a vinyl record. The head moves radially across the disk, writing data to the tracks as the disk spins. This method was used in early HDDs, but has largely been replaced by newer methods.
Perpendicular recording: In perpendicular recording, the magnetic head writes data to the disk by recording it vertically, or perpendicular, to the surface of the disk. This allows for higher data density and capacity, as more data can be stored in a smaller area. Perpendicular recording is the most common method used in modern HDDs.
Shingle recording: In shingle recording, the magnetic head writes data to the disk in overlapping layers, similar to the way shingles overlap on a roof. This method allows for even higher data density and capacity, as more data can be stored in a smaller area. Shingle recording is a newer method that is not yet widely used in commercial HDDs.
Overall, the method of writing data to an analog HDD can have a significant impact on the capacity and performance of the device. Perpendicular recording and shingle recording allow for higher data density and capacity, but may also be more complex and require more advanced technology.
