What the heck IS this thing?

Go to https://www.piavpn.com/HardwareHaven to get 83% off from our sponsor Private Internet Access with 4 months free! Edit: Thanks to all the responses! That "mystery" slot is definitely a compact flash slot, haha. This seems to be a case of overthinking things 🤦‍♂️ ► Want to support the channel and unlock some perks in the process? Become a RAID member on Patreon or YouTube! 🔓 Patreon: https://www.patreon.com/hardwarehaven 🔓 YouTube: https://www.youtube.com/channel/UCgdTVe88YVSrOZ9qKumhULQ/join ► Thanks to @jeffgeerling for the intro! Checkout his Pi NVR: https://www.youtube.com/watch?v=2LayXUxMjPU ► Checkout items I used (includes affiliate links from which I may receive compensation): 🛍️ Razberi on eBay: https://ebay.us/t04Gs7 🛍️ Patch Cables: https://amzn.to/4cy8fxJ 🎥 Curious About the equipment I use to make my videos? Click Here ► https://hardwarehaven.media/gear --------------------------------------------------- Music (in order): "Hardware Haven Theme" -Me (https://youtu.be/FwD2mOYDPNA) "Sunshower" - LATASHÁ(https://soundcloud.com/best-music-pro...) "CRENSHAW VIBES" - GARRISON (https://soundcloud.com/garrison-brown) "If You Want To" - Me "Town Groove" - Me --------------------------------------------------- Timestamps: 0:00 A Dumb Cold Open 0:46 What I Actually Bought 2:32 My VPN, PIA (sponsor) 3:43 External IO and Tear-down 5:41 First Boot 6:49 Tear-down Cont. 8:58 Quick Upgrades and Debian 9:16 Networking 11:04 Geekbench 12:26 Power Draw, Temps, Fan Noise 13:18 PCIe Slot and RAID 15:28 NVR with Frigate 18:28 Thoughts