Data Lifetime

Time between a block's creation and its deletion. Find that most blocks live longer than 30 seconds---standard write-delay. Most blocks die from being overwritten.

Use create-based method (focus on all created blocks) vs. Sprite study, which only focused on lifetime of deleted blocks. Difference between the two approaches are created, but never deleted blocks.

Create-based approach yields longer lifetimes as shown in Figure 1 for subset of Sprite results.