Advantages and disadvantages of each backing storage devices
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DVD Digital video Disk
Advantages
DVD drives can read CDs
Very large storage capacity
DVDs are now mass produced so they are relatively cheap
Sound and picture quality is excellent, making them ideal for storing films with video and sound.
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Advantages
Small and portable
Very cheap to produce
Fairly fast to access the data-quicker than magnetic tape
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Most computers can read CDs. if there is no CD drive, a DVD drive can usually read them
Disadvantage
Smaller storage capacity than a hard drive or DVD
Fairly fragile, easy to sanp or scratch
Slower to access than the hard disk
CD
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Solid state -SSD
Advantages
longer lifetime
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Much faster than hard dosks
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Solid state drives are highly expensive and are sold with a hetty price tag unlike conventional HDDs.Thus, SSDs are predominantly available in smaller and affordable storage The storage capacity is usually under 160 GB.
Slow eandom write speed -as erase blocks on SSDs generally are quite large, they"re far slower than
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magnetic tape
disadvantages
Faster startup because there is no spin-up required.
The inability to recover old data is one of the biggest disadvantages of a SSD
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Memory sticks pen drives
advantages
not subject to scratches like optical media
small and lightweight-easy to put on your key ring or in your
no moving parts so they are very reliable
Large storage capacity(up to 256 gb )
can be used in alomost any computer with a USB drive
Disadvantages
their small size meants theyare easily stolen
they have lower access speeds than a hard disk
they are often left in the computers by mistake and lost