Can I play the same game but on two different play disks on xbox 360

I'll repeat myself again(as in the comments).

I don't know about GTA5, but in general SSD would be faster than a normal HDD + BluRay. PS3 uses SATA1, which provides a bandwidth of maximum 150 MB/s(SATA2 allows 300 MB/s and more modern SATA3 provides 600 MB/s bantwidth).

HDD used in PS3 slim reads at 65 MB/s and BluRay at around 9 MB/s(all PS3 models use 2x speed BluRay drives). That sums up to 74 MB/s read speed, which is almost a half of SATA1. If you run solely from an SSD you will achieve these 150 MB/s, which is twice as fast as HDD + Bluray.

And I say that running from an SSD will grant you 150 MB/s because of SATA1 limitations, despite the fact that modern SSDs do have both read and write speed of over 500 MB/s.

As you noticed in second video, both load speed and character switching of SSD is (more than) twice as fast as HDD+Bluray(41 sec vs. 102 sec and 8 sec vs. 16 sec respectively).

And I totally agree with Nolonar's comment.

If you're going for 100% completion in story mode to hunt easter eggs, the best way to track your progress is via the Rockstar Social Club.

If you sign up and connect your PSN ID to your Social Club login, you'll be able to track your progress in real-time via their website. There's a percentage there that is kept up to date while you play.

For 100%, you need to complete:

• All missions, including assasinations. I believe there are 69, but it may vary depending on your choices during the game (ie, heists especially)
• 42 hobbies. Some hobbies are optional for 100%, there are 59 total.
• 20 strangers and freaks. There are 59 total, so there are a lot of optional ones.
• 14 random events. This is the only one where it doesn't matter which ones you complete.
• 16 "misc" activities of 30 total. This includes spaceship parts, letter scraps, knife flights, stunt jumps, and under the bridge stunts - all of them.

Since not everything counts and it can be hard to keep track, the Social Club is a lifesaver. It even has a map that lists the collectibles, the random events, and the strangers/freaks.

They don't track the stunts (knife flights, stunt jumps, under the bridge) so you'll need to track those yourself, lest you lose track and forever be missing one.