Simplify the following text for a Grade 6 native English-speaking person.
Original: In practice then , the chances of a second failure before the first has been recovered is not nearly as unlikely as might be supposed , and data loss can , in practice , occur at significant rates .
Simplified: In practice , there is a chance that a second disk will also fail before the first has been recovered . This means that data loss can occur at significant rates , in practice .