Analyzing this from the following problems: 1. There is the error messages: the specified drive cannot be accessed or drive failure, etc. 2. The computer is not working smoothly when reading the specified drive. 3. The owner of the computer wants to up-grade the CD-rom or DVD-rom to higher specification for faster performance ..... etc. What is CD-ROM ? The following information is from the website : http://en.wikipedia.org/wiki/CD-ROM
CD-ROMs are popularly used to distribute computer software, including games and multimedia applications, though any data can be stored (up to the capacity limit of a disc). Some CDs hold both computer data and audio with the latter capable of being played on a CD player, while data (such as software or digital video) is only usable on a computer (such as ISO 9660 format PC CD-ROMs). These are called enhanced CDs.
Although many people use lowercase letters in this acronym, proper presentation is in all capital letters with a hyphen between CD and ROM. It was also suggested by some,[who?] especially soon after the technology was first released, that CD-ROM was an acronym for "Compact Disc read-only-media", or that it was a more "correct" definition. This was not the intention of the original team who developed the CD-ROM, and common acceptance of the "memory" definition is now almost universal. This is probably in no small part due to the widespread use of other "ROM" acronyms such as Flash-ROMs and EEPROMs where "memory" is usually the correct term.[citation needed]
At the time of the technology's introduction it had more capacity than computer hard drives common at the time. The reverse is now true, with hard drives far exceeding CDs, DVDs and Blu-ray, though some experimental descendants of it such as HVDs may have more space and faster data rates than today's biggest hard drive
What is DVD ROM ? The following information is from the website : http://en.wikipedia.org/wiki/DVD-ROM
DVD, also known as Digital Video Disc or Digital Versatile Disc, is an optical discstorage media format, and was invented and developed by Philips, Sony, TOSHIBA, and Time Warner in 1995. Its main uses are video and data storage. DVDs are of the same dimensions as compact discs (CDs), but store more than six times as much data.
Variations of the term DVD often indicate the way data is stored on the discs: DVD-ROM (read only memory) has data that can only be read and not written; DVD-R and DVD+R (recordable) can record data only once, and then function as a DVD-ROM; DVD-RW (re-writable), DVD+RW, and DVD-RAM (random access memory) can all record and erase data multiple times. The wavelength used by standard DVD lasers is 650 nm;[4] thus, the light has a red color.
DVD-Video and DVD-Audio discs refer to properly formatted and structured video and audio content, respectively. Other types of DVDs, including those with video content, may be referred to as DVD Data discs.
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CD Rom and DVD Rom comparison:
CD Rom: read the data from the cd disk to display or execute on the computer screen, cannot record any new prepared data to the cd disk. If you want to record any new prepared data to the cd disk, your computer must have the CD writer (CD writer = CD burner = CD-RW) and new cd-r disk or cd-rw disk. DVD Rom: read the data from the dvd disk to display or execute on the computer screen, cannot record any new prepared data to the dvd disk. If you want to record any new prepared data to the DVD disk, your computer must have the DVD writer (DVD writer = DVD burner = DVD-RW) abd new dvd-r disk or dvd-rw disk.
Cd disk: storage capacity is less than dvd disk, cd disk's price is cheaper than dvd disk DVD disk: storage capacity is larger than cd disk, dvd disk's price is more than cd disk.
CD rom: can read cd disk, cannot read dvd disk DVD rom: can read both cd and dvd disks
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