For 4K random reads, you'll probably want more than 32 iodepth, even on a consumer drive like this. And you'll want to try to write to each offset in the drive

For 4K random reads, you'll probably want more than 32 iodepth, even on a consumer drive like this. And you'll want to try to write to each offset in the drive beforehand in case they have a "return 0" shortcut (like many enterprise drives).