SAS is also exceptionally reliable as a technology compared to a SATA or NL-SAS disk drive. When talking about reliability, it is important to consider how many errors occur on the disk’s media platters. In the case of SATA and NL-SAS, the ‘Bit Error Rate’ (BER) is around 1 in every Quadrillion.
This can be contrasted with SAS, which has a BER of 1 read bit error in every 10 Quadrillion. Going by these figures, the latter technology is around 10 times more reliable than the other two, which is quite significant when you take into account that every read error is data lost.
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