PS2 had an HDD bay… and released in 2000ps2 has memory cards I have xbox 2 tb sata in xbox classic
The slim wasn’t the OG PS2.ps2 slim doesnt I know I sold it after 2 weeks becouse not hdd
Wait, wait... didn't the PC Engine CD-ROM² also have internal storage to save your progress back in 1988?The answer to this question relies heavily on how you choose to word it...
If you specify "Hard Drive" then it's the PS2 or Xbox depending on if you also specify including it in the box or not since both had it. PS2 launched first but you had to supply your own HDD. Xbox had it built into the console. PS2 slim doesn't count since you essentially are modding in your own storage to an IDE interface present on the motherboard. If that were to count then then the Dreamcast counts too. It released in 2000 and had an ide interface on the motherboard you could mod in a Hard Drive with just by cutting the head off one end of an IDE cable and soldering the wires to the DC motherboard.
If you only specify it as "Internal Storage" then the winner would be the Amiga CD32 in 1996. It had internal storage that a few games took advantage of to save your progress. It was the only option available on that console for saving a game without buying a floppy drive add-on and that was more meant to play floppy disk games and save those games to their own disks.