![hard drive - What is the purpose of this 4-pin interface on SATA HDDs and why doesn't it exist on SSDs? - Super User hard drive - What is the purpose of this 4-pin interface on SATA HDDs and why doesn't it exist on SSDs? - Super User](https://i.stack.imgur.com/oZYUu.png)
hard drive - What is the purpose of this 4-pin interface on SATA HDDs and why doesn't it exist on SSDs? - Super User
![HITACHI (HTS541612J9AT00) 120 GB HDD 2.5" 8 MB 5400 RPM IDE Laptop Hard Disk 829686000643 | eBay HITACHI (HTS541612J9AT00) 120 GB HDD 2.5" 8 MB 5400 RPM IDE Laptop Hard Disk 829686000643 | eBay](https://i.ebayimg.com/images/g/SXcAAOSwpDdVbSBY/s-l1200.webp)
HITACHI (HTS541612J9AT00) 120 GB HDD 2.5" 8 MB 5400 RPM IDE Laptop Hard Disk 829686000643 | eBay
StarTech.com Dual M2 to SATA Adapter with RAID - 2x M.2 SSDs to 2.5in SATA - 25S22M2NGFFR - Storage Mounts & Enclosures - CDW.com
![Seagate 120GB ST9120822A Hard Disk Drive HDD 2.5" 8MB 5400RPM PATA Laptop disk 683728088835 | eBay Seagate 120GB ST9120822A Hard Disk Drive HDD 2.5" 8MB 5400RPM PATA Laptop disk 683728088835 | eBay](https://i.ebayimg.com/images/g/vNcAAOSwpDdVL2n2/s-l1200.jpg)