User guide

Scrubbing the user files on a BlackBerry device when deleting all BlackBerry device data
If a BlackBerry® device supports a partition of flash memory to store files that a user saved to the on-board device memory and
you or a user turned on content protection, the memory scrub process overwrites that section of the BlackBerry device memory
by writing a single character before the memory scrub process deletes the data. The memory scrub process performs the following
actions:
1. writes 0x55 to each byte (0101 0101
2
)
2. writes 0xAA to each byte (1010 1010
2
)
3. deletes all blocks, and changes all bytes to 0xFF (1111 1111
2
) or 0x00 (0000 0000
2
)
Security Technical Overview
Scrubbing the memory of a BlackBerry device when deleting all BlackBerry device data
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