Raspberry Pi X829 Dual 2.5" SATA SSD/HDD Storage Expansion Board, X829 USB 3.1 Shield for Raspberry Pi 4 Model B|Demo Board| - AliExpress
Amazon.com: Western Digital(WD) BLUE Deskptop 1TB( 1Terabyte) 3.5"Hard Disk Drive, 5400~7200RPM, SATA3 ( 6.0GB/s), 64MB Cache, IDEAL for PC/Mac/CCTV/NAS/DVR/Raid and SATA Applications, 1YR Warranty (Blue) : Electronics