A computer has instructions that require two bus cycles, one to fetch the instruction and one to fetch the data. Each bus cycle takes 250 nanoseconds and each instruction takes 500 nanoseconds (i.e., the internal processing time is negligible).

The computer also has a disk with 16,512 byte sectors per track. Disk rotation time is 8.092 milliseconds. To what percentage of its normal speed is the computer reduced during DMA transfer if each DMA takes one bus cycle? Consider two cases: 8-bit bus transfer and 16-bit bus transfer.