5 Main Differences between RAID 0 and RAID 1

Redundant array of independent disks (RAID) is a storage technology. And different level of RAID has its own characteristics. For common computer users, RAID 0 and RAID 1 are two widely chosen projects. If you cannot decide which level is better for you, you can refer to this article which compares these 2 projects in 5 main aspects.

Redundant array of independent disks (RAID) is a good choice for people who want to improve their data storage performance in many aspects. And RAID 1 and RAID 0 are two basic projects that can almost satisfy the needs. For instance, when you come cross data corruption like corrupt pst files and want to attempt an Outlook repair, you can simply resort to data redundancies in RAID. Thus, to decide which project is the better one for you, you can have a look at following 5 comparisons.

RAID 0 and RAID 1

1.Key feature

In RAID 0, data is striped evenly in each of the hard disks of the array. But in RAID 1, data is mirrored and integrallty stored in every hard disk of the array. To put this in perspective, RAID 0 will corrupt once any of the hard disks come across errors. So in this case, you will probably suffer data loss. However, in RAID 1, if one hard drive gets damaged, other hard drives won’t be influenced at the same time. Thus, you can safeguard the data as soon as possible.


RAID 1 provides a much better reliability than RAID 0 due to its redundancy. In other words, data is still safe in RAID 1 when one of the hard drives fails. And apparently, RAID 0 which don’t have redundancy cannot guarantee it. However, what you also should know is that RAID arrays don’t protect your data from gradual decay of storage media.


RAID 0 is faster than RAID 1 in reads. Actually, the read speed of the array is the sum of all the disks’ transfer speeds. Thus in ideal situations, only the RAID controller can limit the speed. However, data redundancy in RAID 1 slows its read speed. The speed can only reach the same as a single hard drive.


Because the data is split and written evenly to all disks in RAID 0, but in RAID 1, each disk has to store the entire data as a copy. Thus the write speed of RAID 0 is much faster than RAID 1, and nearly same as writing to a single hard drive in RAID 1.


For RAID 0, the total storage is equal to the sum of all the individual hard drives’ storage capacities. And when it comes to RAID 1, the total storage is the same as any of the hard drives because every hard disk in the array stores all the data inside. Thus we can find that if you have a great amount of data to store, then RAID 1 demands more identical hard drives than RAID 0.

Author Introduction:

Allissa Shen is a data recovery expert in DataNumen, Inc., which is the world leader in data recovery technologies, including SQL Server repair and word recovery software products. For more information visit www.datanumen.com

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