The problem is that many organisations do not adhere to manufacturers’ recommendations to replace their tapes every three months even though magnetic media degrade simply due to normal atmospheric conditions.
Cassettes also have a habit of stretching over time, while tape drives are known to be the most single most regularly defective element of server infrastructure – a worrying factor in an increasingly digitised age as, should disaster strike years down the line,
such technology is likely to have become obsolete and difficult to replace.
With disk-to-disk environments, on the other hand, none of these issues occur.
Their reliability can be measured in years rather than months, particularly if systems are set up in resilient RAID 5 or 6 configurations, and fears around data integrity have, therefore, become a thing of the past.
Also, because data is written to a hard drive, it can be recovered even in the case of accidental overwrites as an imprint remains - and such recovery occurs at much quicker speeds than was traditionally the case.
This is because, like CDs, disk drives write and read data in a linear fashion, which makes information much quicker to retrieve than if it is held on tape in a typically random format.