4 - 10 MC55 Integrator Guide
Storage
Mobile 6 contains three types of file storage:
•
Random Access Memory (RAM)
•
Persistent Storage
•
Application folder.
Random Access Memory
Executing programs use RAM to store data. Data stored in RAM is lost upon a warm boot. RAM also included a
volatile file storage area called Cache Disk.
Volatile File Storage (Cache Disk)
Windows Mobile 6 memory architecture uses persistent storage for all files, registry settings, and database objects
to ensure data is retained even after a power failure. Persistent storage is implemented using Flash memory
technology which is generally slower than volatile RAM memory. In certain situations the speed of the operation is
more important than the integrity of the data. For these situations, Zebra has provided a small volatile File Storage
volume, accessed as the Cache Disk folder. Disk operations to the Cache Disk folder are much faster than to any
of the persistent storage volumes, but data is lost across warm boots and power interruptions.
DO NOT use the Cache Disk as a method to improve application performance. Analyze applications that perform
slower in persistent storage to optimize disk access. Common areas for optimization include minimizing the
number of reads and writes to a file, removing unneeded debug logging, and minimizing file flushing or closing
files.
Persistent Storage
Windows Mobile 6 protects all data and applications from power-related loss. Because Windows Mobile 6 mounts
the entire file system and registry in persistent storage (rather than using RAM), MC55 devices provide a reliable
storage platform even in the absence of battery power.
Persistent storage provides application developers with a reliable storage system available through the standard
file system and registry APIs. Persistent storage is optimized for large reads and writes; therefore, applications
reading and writing data in large chunks tend to outperform those applications reading and writing small blocks of
data. Data in persistent storage is lost upon a clean boot.
Persistent storage contains all the directories under the root directory except for Application, Cache Disk, and
Storage Card (if a storage card is installed). Persistent storage is approximately:
•
128 MB RAM/256 MB Flash configurations: 60 MB (formatted)
•
128 MB RAM/512 MB Flash configurations: 360 MB (formatted)
•
256 MB RAM/1 GB Flash configurations (MC55A0 only): 703 MB (formatted)
Application Folder
The Application folder is a super-persistent storage that is persistent even after a clean boot. Accessing data in the
Application folder is slower than accessing persistent storage. The Application folder is used for deployment and
device-unique data. For example, network profiles can be stored in the Application folder so that connection to the
network is available after a cold boot. The Application folder is approximately:.
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