Answer
409,600 bytes
Work Step by Step
There are 5 platter with 10 tracks on both sides
=> total number of tracks = $5\times10\times2 = 100$
There are 8 sectors in each track
=> total number of sectors = $100\times8 = 800$
Also each sector have a capacity of 512 bytes
=> total capacity = $800\times512 = 409600$ bytes
