Flash has already killed the 15,000-RPM "high performance" disk drive and mature 4-bit per cell "QLC" is taking aim at the 10,000-RPM performance tier. micron-5210-ion-enterprise-ssd-review Micron's weapon of choice to disrupt the 10K market is the 5210 Ion 2.5" SATA SSD. The 5210 Ion is the first 4-bit per cell SSD with the full gamut of enterprise features. The series is a direct swap to upgrade existing servers running spinning disks. The upgrade improves performance, power consumption, reliability and capacity. These are the same talking points for flash we've heard through the years. The difference now is even lower cost per gigabyte and improvements in density. The 5210 Ion isn't just an upgrade model for existing servers. Modern workloads such as machine learning have increase data set sizes without increasing the number of writes to the disk. In years past, we saw a four reads to one write ratio as normal in the datacenter but the ratio has significantly changed in recent years. Micron tells us key customers see 5,000 reads to one write with many modern workloads. These workloads ushered in the QLC era.