ReclaiMe Data Recovery Training

RAID Recovery Course - Entropy Analysis Test

What analysis gives you a visual representation of parity blocks?

ratio of zeros analysis
entropy analysis
parity analysis

Entropy is a measure of data randomness

false
true

Check the parameters you should vary in entropy analysis

disk order
block size
RAID level
number of disks

Look at the picture on the right and choose the most complete configuration description

full 4-disk RAID5, 16 KB block size
4-disk RAID5 with one disk missing, 16 KB block size
full 4-disk RAID5, 64 KB block size
full 4-disk RAID5, 32 KB block size

How to do entropy analysis

launch the analysis and wait until ReclaiMe Pro gives you the correct RAID configuration
change settings to make pictures match expectations

Choose that which has the lowest entropy

text
video
parity in a RAID

Check the criteria of a correct picture in entropy analysis

has several peaks
peaks do not overlap
has one peak per disk
there is one overlap in peaks

Choose to what you should apply the entropy analysis

each disk separately
full disk set

When to apply entropy analysis?

between zero and mirror analysis
before content analysis
after content analysis

Choose that which has the highest entropy

text
video
parity in a RAID

Next lesson - Parity Analysis

We have a mailing list in which we talk about interesting cases we encounter and share some tips and tricks.