When using RAID 1 it is needed to access data stored on the second member disk as well. Otherwise it may lead to that a bad sector appears on the second member disk. In this situation the RAID 1 doesn't have redundancy any longer and on top of that you do not know it. Absolutely the same is true for hot spare drives.
Typically one of the causes of this issue is the array being idle. To avoid this situation you can inspect both copies of data while reading. It should be noted that heavily loaded RAIDs do not have such issue.
In Windows, at least up to Windows 2003, RAID1 software implementation usually reads from the first drive, rendering RAID 1 unreliable.
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