Courses Hub - Disk Operating System The first computers did not have modern storage devices such as hard drives, optical drives, or flash storage. The first storage methods used punch cards, paper
![𝔸𝕟𝕒𝕥𝕠𝕝𝕪 𝕊𝕙𝕒𝕤𝕙𝕜𝕚𝕟💾 on Twitter: "Microsoft Defrag for MS-DOS (with sound) https://t.co/TI39ydZKKS" / Twitter 𝔸𝕟𝕒𝕥𝕠𝕝𝕪 𝕊𝕙𝕒𝕤𝕙𝕜𝕚𝕟💾 on Twitter: "Microsoft Defrag for MS-DOS (with sound) https://t.co/TI39ydZKKS" / Twitter](https://pbs.twimg.com/ext_tw_video_thumb/1181757047576104962/pu/img/4dlQNcEsm0Abi4tT.jpg)
𝔸𝕟𝕒𝕥𝕠𝕝𝕪 𝕊𝕙𝕒𝕤𝕙𝕜𝕚𝕟💾 on Twitter: "Microsoft Defrag for MS-DOS (with sound) https://t.co/TI39ydZKKS" / Twitter
![foone🏳️⚧️ on Twitter: "BTW if you're wondering "how do you get out of this kind of mistake, where DOS can't finish booting?" You can hit F8 when it says "starting MS-DOS" and foone🏳️⚧️ on Twitter: "BTW if you're wondering "how do you get out of this kind of mistake, where DOS can't finish booting?" You can hit F8 when it says "starting MS-DOS" and](https://pbs.twimg.com/media/EaXAXcnUwAAWuaO.png)