TestOut LabSim A+ Certification Practice Exam

What happens in RAID 0 if one disk fails?

1. All data is retained on the surviving disk

2. Partial data is recoverable

3. All data is lost

4. Only data from the other RAID volumes is lost

The correct answer is: All data is lost

In RAID 0, data is striped across multiple disks to improve performance by allowing simultaneous read and write operations. However, this configuration does not provide any redundancy or fault tolerance. This means that data is divided into smaller chunks and each chunk is written to separate disks alternately. When one disk in a RAID 0 array fails, the entire array becomes unusable because the data on the failed disk is crucial for reconstructing the complete dataset stored across all disks. As a result, all data is lost. This loss occurs because the remaining disk(s) do not hold a complete copy of the data; they only have pieces of it. Thus, if any part of that striped data becomes unavailable, the ability to access the total data is compromised, leading to complete data loss from the RAID 0 setup. This characteristic of RAID 0 highlights the importance of backup strategies when using this level of RAID, as it is not designed for data protection.