The last 5.25 inch disk I saw was make by Quantum under the their Big Foot series. I called the flat foot due to the pathetic life of the product.
I expect 40K power on hours (I use lots of disk in my server) per disk. If they cannot do that, they are ■■■■ in my opinion.
My gaming box has 1 large disk, the server has a puny boot disk and 3 larger ones.
I have 3 more in bags as spares. More in spare machines.