The 3.5-inch mechanical hard drive (or 2.5-inch SSD) is usually mounted in a caddy on the lower-left side.
Disassembling the Acer Aspire ZC-610 AIO requires removing the stand, unscrewing the rear chassis, and carefully prying open plastic clips. Internal components, including the 3.5-inch hard drive and RAM, are then accessible for upgrades like SSD installation. For a detailed visual guide on a similar model, watch this YouTube video . acer aspire zc610 disassembly full
Would you like the page numbers for screw sizes or connector pinouts? unscrewing the rear chassis