I seriously doubt if any head units contain an actual physical hard drive. Much more likely flash solid state persistent memory chip(s).You dont need a hard drive. Some head units accept a 512 GB SD card.
You also dont want to use hard drives. Slow as ****, mechanical moving parts = prone to failure. The absolute worse way to go to be honest. Only thing that would moderately work is a Solid State Hard drive "SSD" but even then an SD card would be just as fast.
A head unit with a built in SSD would cost an exhorbitant amount of money which you could have achieved the same results with a normal head unit with an SD card reader.
Even with your computer bud, if you are still using a normal hard drive, its the main reason why a computer can feel sluggish.
Between a normal hard drive and an SSD drive its not just a night and day difference. Its way beyond that, it can make a 10 year old computer look like sonic the hedgehog from a 8 minute boot up time to 15 seconds bootup speed. I'd look into putting one into your comp asap bud.
A miniscule point of correctness, but this is my second career baileywick! Computer engineering.
John Kuthe...
