samplemem

samplemem allows checking whether a large range of memory contains the same byte over and over by sampling a given number of blocks.

The samples are spaced equidistantly over the whole file.

Usage

samplemem <block_device> <block_size> <value_to_check> <n_samples>

Where:

• block_device: file to check by sampling
• block_size: size of a block
• value_to_check: byte containing the value that has to be the same for the whole block
• n_samples: number of samples to check

Output:

• block_number of each checked block that failed the check

Example

E.g.: To check if the drive at /dev/sdd only contains the value 0x55 by checking the memory using 1024 samples and a block size of 4096:

Example:

sudo ./samplemem /dev/sdd 4096 0x55 1024