Direct access to flash memory via PCI Express (see NVM Express: Flash At PCI Express Speeds) looks to replace disk-based interfaces like SATA and SAS (see What's The Difference Between SATA And NVMe?). Flash can utilize all the bandwidth of x8 PCI Express interfaces while single hard drives struggle to fill one lane. Arrays of hard drives can deliver higher bandwidth but they still suffer from access latency that is minute for flash storage.