No fragmentation file content carving.


Learners are to form pairs and for the first task partners will individually consider and devise an algorithm to carve file content from a file system that exhibits no fragmentation.

Figure 1: Contiguous file content with no fragmentation


Task 1: Preparing the file system.

In advance of devising a solution to carve such a file, pairs should:

  1. Divide the files between partner. One partner should take File A, B and C and the other partner should take File D, E and F. Each partner should use the scissors and follow the cutting guidelines to segment the files into file blocks.

  2. Partners should identify the FIRST file block for each file, flip each of them over and write the label FF D8 FF on the back. Similarly, partners should then identify the LAST file block for each file, flip them over and write the label FF D9.

  3. Partners should then take all the remaining file blocks for each file, ensure they are in sequence and flip them over and write their corresponding number in the sequence on the back, for example: the second file block for each file should be labelled 2, the third 3 and so and so forth until the penultimate file block for each file.

  4. Partners should then arrange each of the file blocks on a mock file system container as illustrated in Figure 1. Partners should place them in the correct sequence and then flip each over so that the file content is visible.

Task 2: Devising and executing a file content carving algorithm.

Learners are now ready to consider and devise an algorithm to carve file content. Learners should:

  1. Learners exchange their completed mock file system containers with file blocks with their partners.

  2. Learners should spend no more than 15 minutes devising an algorithm alone to recover each of the files from the received file system container.

  3. After 15 minutes learners should exchange their algorithm and file system container with partners. Learners should ensure the file system container is returned the same as they received it.

  4. Learners should spend no more than 5 minutes slavishly follow the algorithm and recover the files from the mock file system containers.