CD-ROM stands for Compact Disc
Read-Only Memory
, a mass storage medium utilizing an optical laser to read microscopic pits on the aluminized layer of a polycarbonate disc. The same format is used for audio Compact Discs.
How does CD-ROM store data?
Data is stored on the disc as
a series of microscopic indentations called “pits”, with the non-indented spaces between them called “lands”
. A laser is shone onto the reflective surface of the disc to read the pattern of pits and lands. … This is converted into binary data.
What is the storage capacity of CD and ROM?
With a storage capacity of
680 megabytes
, the CD-ROM found rapid commercial acceptance as an alternative to so-called floppy disks (with a maximum capacity of 1.4 megabytes).
Is a CD a storage medium?
CDs, DVDs, and Blu-Ray discs are used for a lot more than playing music and videos—they also act as storage devices. Collectively they're known as
optical storage devices
or optical media.
What type of storage does a CD drive use?
A CD-ROM (Compact Disc Read Only Memory) is
an optical storage medium
that can hold about 670MB. “Optical” means that light is used to read the data from the disk (it is not a magnetic medium).
What is the purpose of CD-ROM?
Used to store programs and data files
, a CD-ROM holds 650MB or 700MB of data and employs a different recording format than the audio CD (CD-DA), from which it evolved. In the 1990s, the CD-ROM rapidly replaced the floppy disk for software distribution.
What is the difference between hard disk and CD-ROM?
1) Hard disk : It is an electro mechanical data storage device. Information remains intact even after switching off the computer. 2) CD ROM : It is a pre-pressed optical compact disk that stores data. It stands for Compact Disk : Read Only Memory.
What are the advantages and disadvantages of CD-ROM?
| Advantages of CDs Disadvantages of CDs | Small and portable Fairly fragile, easy to snap or scratch |
|---|
Are CD ROMs still used?
CD-ROM
will become pretty much obsolete in countries
with decent internet coverage within the next 5 years, especially since band with keeps improving. … Although DVD-ROM might become a more useful (but also more expensive) carrier, since the file size of software is still increasing rapidly.
Is CD-ROM a memory register?
The correct answer is
secondary memory
. CD-ROM stands for Compact Disc-Read Only Memory. It is used for storage of Secondary memory or secondary storage. … Memory Register that either store the memory address from which data will be collected to the CPU, or the address to which data will be sent and stored.
What are the disadvantages of a CD?
- Limited liquidity. One major drawback of a CD is that owners can't easily access their money if an unanticipated need arises. …
- Inflation risk. CD rates tend to lag rising inflation on the way up and drop more quickly than inflation on the way down. …
- Low relative returns. …
- Re-investment risk. …
- Tax burden.
How many times can a CD be played?
Standard CDs have a diameter of 120 millimetres (4.7 in) and are designed to hold up to 74 minutes of uncompressed stereo digital audio or about 650 MB of data. Capacity is routinely extended to
80 minutes
and 700 MB by arranging more data closely on the same sized disc.
What replaced CDs?
An Obsolete Format
But now, many new cars no longer have CD players. Manufacturers have replaced the aging CD player with
touch-screen media centers
that offer streaming services, hands-free Bluetooth® and can play digital files from portable USB drives.
Why do laptops no longer have CD drives?
Size is of course the most obvious reason that they've essentially disappeared. A CD/DVD drive takes
up a lot of physical space
. The disc alone requires at least 12cm x 12cm or 4.7′′ x 4.7′′ of physical space. As laptops are made to be portable devices, space is extremely valuable real estate.
Which is the permanent storage device?
Permanent storage, also called persistent storage, is any computer data storage device that retains its data when the device is unpowered. A common example of permanent storage is the
computer's hard drive or SSD
. Examples of permanent storage devices.
Why do I need stiffy drive if I have CD-ROM?
If a hard disk drive holds more information than a floppy disk drive, accesses the information faster, and reads and writes information, then why do we need CD-ROM drives? The answer is simple:
a compact disc can hold large amounts (650 MB) of removable data and can be mass-produced at a very low cost
.
