Hello Carlos. I don't remember the excact number, but the memory of the user drive of the Tyros is very small. You can store some styles or songs, but you wil soon get out of space. Use the user drive as a work bench to keep styles and songs while working on them, and then transfer them to a USB stick. There is an optional harddrive for the T2, but if you do not have that installed, you have little memory.