OSX: 10.9 important update technical details of mavericks (2)

Disk System:

Core storage:

Core storage is Apple's latest logic volume Management (LVM) technology. In fact, core storage has existed for a long time. It first appeared in the 10.7 lions system, but at first it was only a hidden function of the command line and was not found by more people, it can be said that this is the logical partition management of the Apple version. The earliest way to get into everyone's field of viewThe actual application isFully encrypted filevault 2 and the new version of IMAC with fussion drive, but core
Storage is always hidden. The ZFS implementation on OS X may be subject to copyright restrictions, resulting in Apple's own development of a new core storage. Because of the concept of logical volumes, an intermediate layer is built between the file system of the physical disk and the OS, providing more possibilities and flexibility than traditional file partitions.

Helper balance partition:

It cannot be confirmed whether it was officially announced by Apple for the first time, but this already exists at filevault 2. It is a hidden partition, and the system uses it to start the system. For example, when disk encryption and raid are used, the content of the boot partition cannot be accessed before the system starts, OSX then uses it to start the necessary driver of the system. In addition, the system retains the boot partition information for the last three jobs. Once a partition is damaged, the system will not be able to start.