GranTurismo wrote:too big to back up
i dont have another media to back up
i just have 4gb flashdisk
any other way to create another partition to solve this problem?
No, no other way to do it. The file system is encrypted so even if you were to connect the drive to another machine you still wouldn't be able to resize it.
I've had cases where the PS3's full system backup would fail so I had to backup all my save games, pics, music, etc. manually then re-download all the games and DLC after formatting. Not fun. That was back when you could still access PSN on a <= 3.15 FW system with OtherOS, though.
So... not sure what's best in your case. You can always swap hard drives if you have another 2.5" SATA available and just use that for OtherOS.
anyway if i just instal it in the same XMB partition what will be happen??
There's no way to install it to the same partition, so nothing would happen.