Argon40 has gone to Kickstarter with a $127 “Argon Eon” NAS server for the Raspberry Pi 4 equipped with 2x 2.5-inch and 2x 3.5-inch SATA bays for up to 40TB plus a 12V/5A supply, fan, RTC, and OLED display.
DIY NAS and a tiny homelab : r/homelab
PiNAS: Make your Raspberry Pi into an affordable NAS - News
How many hard drives can you connect at the same time to a raspberry pi? - Quora
Argon 40 EON First Look! A Raspberry Pi 4 Powered 4 Bay NAS
Argon EON Pi NAS Case 4-BAY SATA HDD SDD Network Attached Storage RTC Aluminum Enclosure BYO NAS for Raspberry Pi 4 Model B - AliExpress
Quad-bay Raspberry Pi NAS starts at $127
Argon40 EON 4-Bay Network Attached Storage (NAS) powered by Raspberry Pi 4 - Micro Center
Raspberry Pi CM4 launches with smaller footprint, quad -A72 CPU, and optional WiFi
Argon EON Pi NAS Case 4-BAY SATA HDD SDD Network Attached Storage RTC – 52Pi Store
48TB Raspberry Pi NAS with SSD storage costs $5,000 - Geeky Gadgets
Argon EON Pi NAS Case 4-BAY SATA HDD SDD Network Attached Storage RTC Aluminum Enclosure BYO NAS for Raspberry Pi 4 Model B - AliExpress
Argon EON 4-Bay Network Storage Case and RPi 4B Kits
Argon EON Pi NAS Case (Network Attached Storage) for Raspberry Pi 4 : Electronics
Argon EON 4-Bay Network Storage Case and RPi 4B Kits
Argon Neo Raspberry Pi 4 Case Aluminum Metal Shell Sliding Magnetic Cover Passive Cooling Silicon Heat Sink For Rpi Model 4b - Demo Board Accessories - AliExpress