[Symmetry]

Cost isn't linear with storage. On Newegg a 1 TB drive is $37, a 2 TB is $61, a 4TB is $84, a 6 TB is $158 for $26/TB. The metal shell of the HD costs a certain amount no matter how much storage is inside. Still not a full factor of 10 but certainly more significant.

[zzzcpan]

HDD market is basically a monopoly with arbitrary prices not reflecting actual cost of anything. They only compete on price with SSDs.

[ryacko]

It’s a monopoly? Kryder’s law may have ended, but HDD prices were $40 a terabyte two years ago.