An interesting effect of the platter’s shape is that accessing data along the outer tracks is faster than accessing data from inner tracks. To understand the reasoning behind this, first consider that the data density (i.e., data per unit …
Rajat Kateja, After Hours Academic
This seemingly low-level detail is used for real impact in systems. For example, Netflix takes into account this discrepancy in the access throughput across inner and outer tracks in their content distribution appliances.
Source: 'Netflix: Streaming Entertainment to 200 Million Members Around the World' keynote from FAST 2021 https://www.usenix.org/conference/fast21/presentation/keynote-looney