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In the process of combining with the internal memory, the card is reformatted. This is a purely logical merge operation, remotely resembling creating a spanned volume from multiple physical disks in Windows. In fact, it creates an ext4 or F2FS partition on the card and adds it to the user section of the internal memory. The Adoptable Storage function allows you to combine the user partition in the built-in memory with the partition on the card into one logical volume. This is GoogleвЂ™s attempt to keep the sheep safe and the soldiers satisfied. Adapt it!ДЄndroid Marshmallow has a compromise called Adaptable Storage - Adoptable Storage.

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They showed the wrong amount of free space, because they believed that the application supposedly takes up space in the internal memory and on the card at the same time. However, file managers introduced confusion, many of which handled links incorrectly. In this case, the application was determined by the standard address in the built-in memory, but in fact it was on the card. More or less only the option of creating hard or symbolic links worked. Large manufacturers caught the signal and added their own monitoring functions to the firmware, which determine the user's attempts to force applications to be transferred to the card using the root. In the fifth Android, Google again decided to return to the original concept and did everything possible to make the transfer of applications to the memory card as difficult as possible. How it works in a particular device was only possible to find out experimentally. It was possible to designate a memory card as a disk for installing programs by default, but not all firmware correctly supported this function. Due to such a trick, their creation was guaranteed to receive a residence permit in the internal memory with a large dubbing resource and high speed.ДЇrom the fourth version in Android, it became possible to choose where to place the application. They deliberately made it so that the transfer of programs by regular means became impossible.

If applications heavily used read / write operations, then the reliability and speed of cards could no longer satisfy developers. For some, the directory with user data was immediately located separately, while for others it was in a subdirectory of the program itself. The very possibility of transferring applications depended on their type (pre-installed or third-party) and internal structure. Moreover, it was a half measure: many programs were partially transferred, leaving some of the data in internal memory, and some (for example, system or containing widgets) were not transferred to the card at all. It was implemented using the concept of encrypted containers for each application, but it protected it exclusively from falling into the wrong hands of the card - but not of the smartphone.

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The ability to transfer not only multimedia files to the memory card, but also applications first appeared in Android 2.2 Froyo. MicroSD (HC) cards with FAT32 completely coped with the role of the simplest storage, freeing the internal memory from photos, videos and music. It was just a multimedia warehouse without any requirements for its protection and reliability. Initially, Android developers assumed the use of a memory card only as a separate storage of user files. Therefore, in each version of Android, approaches to encryption have changed dramatically - from the complete lack of cryptographic protection of removable media to their deep integration into a single section with encryption on the fly.

Its protection requires management of access rights that are not supported by the card-specific FAT32 file system.

Many programs contain activation data, billing and confidential information. Data encryption in Android OS is closely connected with two problems: access control to memory cards and transferring applications to them.

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