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Various storage devices used by an operating system can be arranged as follows in increasing order of accessing speed :

1. Magnetic tapes $\rightarrow$ magnetic disks $\rightarrow$ optical disks $\rightarrow$ electronic disks $\rightarrow$ main memory $\rightarrow$ cache $\rightarrow$ registers
2. Magnetic tapes $\rightarrow​$ magnetic disks $\rightarrow​$ electronic disks $\rightarrow​$ optical disks $\rightarrow$​ main memory $\rightarrow​$ cache $\rightarrow​$ registers
3. Magnetic tapes $\rightarrow​$ electronic disks $\rightarrow​$ magnetic disks $\rightarrow​$ optical disks $\rightarrow​$ main memory $\rightarrow​$ cache $\rightarrow​$ registers
4. Magnetic tapes $\rightarrow​$ optical disks $\rightarrow​$ magnetic disks $\rightarrow​$ electronic disks $\rightarrow​$ main memory $\rightarrow​$ cache $\rightarrow​$ registers

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I think electronic disks are faster than magnetic disk so ans should be d
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yes, I also think so. because our computer-hard- disk ( which is an electronic disk ) is faster than CD-ROM right ??

see this- http://tech.aakarpost.com/2007/11/difference-between-magnetic-and-optical.html
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Going totally wrong direction:

I think electronic disks are faster than magnetic disk so ans should be d

answered Jul 29, 2016 by qwertyui

The electronic r definitely faster coz they r ram or flash (https://en.wikipedia.org/wiki/Solid-state_drive  ) magnetic are 2dary & D option is for only competition with A so we compare optical & magnetic CDs & HDD.

Magnetic disk storage has been optimized for high speeds. DVDs and CDs access data fast enough to play movies and music, but are much slower than a magnetic disk.

So, Ye answer is D) if ur only concern was Key.

& @vijaycs Veteran neither hard disk nor CD(optical sir) is electronic.

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SSD falls in category of electronic disks..

Ans: D

The storage hierarchy is a ranking of storage devices based on several factors: access speed, capacity, cost per bit, and volatility.

• registers - fastest access, highest cost/bit, low capacity, volatile
• main memory - slower access than registers (faster than disks), lower cost/bit than registers (higher than disks), higher capacity than registers (lower than disks), volatile
• electronic disks - a.k.a. flash memory. slower access than main memory (faster than hard drives), lower cost/bit than main memory (higher than hard drives), higher capacity than main memory (lower than hard drives), nonvolatile
• magnetic disks - slower access than flash memory (faster than tapes), lower cost/bit than flash memory (higher than tapes), higher capacity than flash memory (lower than tapes), nonvolatile

In general, it's faster and easier to write data to magnetic storage media as compared to on optical media .

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