processing. The NVM Express (NVMe) standard also supports command queuing, in a form optimized for SSDs. NVMe allows multiple queues for a single controller and device, allowing at the same time much higher depths for each queue, which more closely matches how the underlying SSD hardware works. See also I/O scheduling Write barrier References External links Serial ATA and the 7 Deadly Sins of Parallel ATA at Lost Circuits (for TCQ) Hype vs. Reality analysis at Tom's Hardware Serial ATA