2026-08-17
Enterprise EDSFF drives — the E1.S and E3.S form factors you see in modern servers — are starting to turn up on the second-hand market at tempting prices. The problem? They don't fit anything in a typical homelab. The ADT R27A-BK3 adapter, reviewed in detail by ServeTheHome, solves that by converting either form factor into a standard PCIe x16 slot card.
The adapter is a simple passive riser — no drivers, no firmware to worry about. You screw in your E1.S or E3.S drive, slot it into a PCIe x4 (or wider) slot, and your system sees it as a normal NVMe device. ServeTheHome tested it with both form factors and found it worked without fuss.
Why homelabbers should care
Datacentre decomm EDSFF SSDs are following the same trajectory as U.2 drives a couple of years ago: high capacity, enterprise endurance, falling prices. If you can pick up a 3.84TB or 7.68TB E1.S drive for a fraction of retail, you just need a cheap adapter to make it usable. This is that adapter.
Caveats
- It occupies a full PCIe slot and sticks up quite a bit — check your case clearance, especially in short-depth homelab chassis.
- Passive adapter means no thermal management. E3.S drives in particular can run warm; you'll want some airflow over them.
- Availability is patchy — check ADT R27A-BK3 EDSFF adapter or AliExpress.
- EDSFF drives themselves aren't cheap yet in the UK, but prices are trending down on eBay and broker sites. Give it six months and this adapter becomes essential kit.
If you're already eyeing ex-enterprise NVMe storage and have a free PCIe slot, this is a straightforward way to future-proof your homelab storage on the cheap. Worth bookmarking even if you're not buying today.