
The size of the allocation file can be changed. It tracks the allocation blocks that are currently in use by the system and the ones that are free. The last bytes of the volume is occupied by the backup of the volume header. The next bytes after the boot blocks in the volume header of HFS, which contains the information of the entire volume. The allocation blocks are the groups of logical blocks that are tied together in the form of clumps in order to increase the performance of HFS. They are numbered from the first to the last block present on the given volume and they remain static. The logical blocks are formatted with byte block scheme. In this write up we will put forth the analysis that we carried out on the operating system of iPhone- iOS.

The advancement in the count of criminal offenses at a feverish pace, require innovative technologies to perform iOS forensic analysis on iPhone of the suspect. One of the most dominant challenges that Apple has faced after the launch of iPhone in the market, is the huge group of hackers that have targeted iPhone for accomplishing unlawful activities.
