Mmm, but don't modern HDDs use DMA+IRQ for data transfer? The disk driver issues the read instruction and then it's done until the interrupt arrives? Anyhow, w

Mmm, but don't modern HDDs use DMA+IRQ for data transfer? The disk driver issues the read instruction and then it's done until the interrupt arrives? Anyhow, what are the peripheral devices that support only synchronous access? I don't believe there are any such ones in the modern PCs, but maybe there are some in mobile devices? Old floppy drives?