Panasonic JU-475 5.25" and Alps Electric 3.5" samples
are based on recordings submitted by Andresdelcampo,
edited and updated to support seek/step down by Agetian and Domppari.
Originals can be found here:
https://github.com/andresdelcampo/RetroDriveSounds

Epson samples have been edited and cleaned up from the YouTube video recordings of the SD-880
combo drive consisting of SD-700 (5.25") and SD-800 (3.5") drives in a single unit, recorded
by MausolfB.
Originals can be found here:
https://www.youtube.com/watch?v=_HFfrdFnRKI
https://www.youtube.com/watch?v=xE79AuiYP1s

The samples are 48kHz 16bit 1 channel PCM WAVE samples. 86box code does not make any resampling
and assumes that the host audio system is using 48kHz 16bit output.