The statement which is true about storage media is "Cache memory is much faster than Magnetic disk storage. But it is much expensive than magnetic disks."
The cache memory is faster than both SDDs and HDDs. In mathematical terms, it is 4 time faster than SSDs and 80 times faster than HDDs. Moreover, it is more expensive then the SSDs and HDDs storage. Practically speaking, it is not good to have as much in-memory storage as persistent block storage on SSDs or HDDs.
The remaining statements are incorrect such as "Cost per bit in SSDs is lower than that of a Magnetic tapes". While truth be told the SSD cost more than the Magnetic Tapes.
Magnetic disk storage is faster than SSD storage and hence it is a good candidate for a database that needs faster access time. The statement is also incorrect as SSD are much faster than Magnetic Disk Storage.
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