Silverstone Techology FS304-V Three (3) 5.25" Bay to Four (4) 3.5" SAS 12G / SATA 6G Trayless Hot-swap Cage, SST-FS304B-V

This is ideal for the rack mount case that I'm putting together - I'm already using the three existing 5-1/4" bays for a tape and an optical drive, so I'm replacing one of the 120mm front fan and 5x 3-1/2" drive combo bays with this. A bonus is that if I don't have SAS drives handy for whatever reason, or I need to use laptop drives, this unit has the flexibility to allow me to use SATA or different footprint drives. The actual cage is made of ridiculously heavy gauge metal; it would be difficult to damage, I think. And while I could wish the plastic trays were a little more robust, with care they should last longer than the case itself, and they are easy and precise in regard to insertion and removal. The only surprise in the description was that I had to guess the fan size from the part number in the photo, and I guessed wrong. I thought it had a 120mm fan; it turned out to be 80mm, but it is a nice PWM fan.

Works perfectly in my unraid server. No noise from the unit at all, fits perfectly in the case. Highly recommended.

Terrific construction but the small fan, which is riveted in place and difficult to replace, is quite loud. A larger more standardized fan that could be replaced easily for something quieter would be more suitable for an item intended to be used for years. It’s literally the loudest part of the entire build.

My old one didn’t even have a built in fan.