My Late 2008 MacBook running El Capitan 10.11.6 (could use a RAM upgrade to 8GB and the HDD upgrade to an SSD to make it swifter than it is currently). : r/macbook
How to Upgrade MacBook Air Hard Drive (Original/2008/2009): EveryMac.com
Foto-Tutorial: MacBook Pro auf SSD umrüsten
OWC SSD Upgrade Kits For Mac Pro 2008
2008 MacBook Review: Better than a modern MacBook in many ways
MacBook and MacBook Pro (Non-Retina) SSD Upgrade Kit
Amazon.com: HIGHFINE 2nd 2.5'' SATA HDD SSD Hard Drive Disk DVD CD ROM Optical SuperDrive Caddy Tray Adapter for Apple Unibody MacBook/MacBook Pro 13 15 17 Early mid Late 2008 2009 2010 2011 2012.etc : Electronics
How to Add a 2nd Hard Drive/SSD in a 15-inch MacBook Pro (Late 2008) with OWC Data Doubler - YouTube
Sata Adapter For Lif -/zif Hard Drive+ssd For Macbook Air Late 2008 Mid 2009 A1304 - Pc Hardware Cables & Adapters - AliExpress
How to Upgrade the SSD in a MacBook Air (2008) - YouTube