We have outlined some of the factors for RAID data recovery costs here. But to summarize, data recovery costs will vary due to factors which include: number of drives, operating system, how the failure occurred, RAID configuration level and of course the size of the data loss. Hard Drive Recovery Group has always offered no-risk RAID diagnostics, which basically means, if no data is recovered, there is no charge. Still, our RAID repair lab operates daily, and we rarely run into completely unrecoverable RAID arrays.