SSD · solid-state drive
Flash-based storage with no moving parts, the default medium for the node-local scratch and checkpoint tiers where sustained per-drive bandwidth matters more than capacity cost.
Current numbers
~28.4 / 21.9 GB/sSamsung PM1763 PCIe 6.0 enterprise SSD, in mass production from July 2026: vendor-rated sequential read/write, 16 TB model
~28 / 14 GB/sMicron 9650 (first mass-production PCIe 6.0 x4 enterprise SSD; E1.S and E3.S; ~5.5M IOPS), vendor-rated sequential read/write
~7 GB/s vs ~300 MB/sQLC SSD vs HDD sequential read, with random-read latency of ~110 µs vs ~11–12 ms