Iphone 6s: Ramdisk

However, Apple has deprecated SHSH blobs and APFS snapshots now verify entire boot chains. Newer ramdisk tools must sign the image with a valid (though often leaked) APTicket or use a bootrom exploit to skip signature checks entirely.

To understand the feasibility, one must first appreciate the hardware at hand. The iPhone 6s is equipped with 2 GB of LPDDR4 RAM. By the standards of its 2015 launch, this was generous; by today’s, it is anemic. A modern Windows or Linux machine can happily dedicate 16 GB or more to a RAM disk, storing an entire game or video editing project. On the iPhone 6s, carving out, say, a 512 MB RAM disk would consume a quarter of the system’s total memory. iOS, a ruthless memory manager, would almost immediately terminate background applications and aggressively compress or purge cached data to compensate. The result would not be a faster phone, but a fragile, memory-starved one, prone to app refreshes and kernel panics. The performance gain is also questionable: the iPhone 6s’s internal NVMe-based flash storage (a rarity in 2015) is already remarkably fast for its time, with sequential read speeds approaching 400 MB/s. A RAM disk might double that, but the user would never feel the difference when launching a 5 MB app or playing an MP3. ramdisk iphone 6s