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Mike Meyers A+ Guide to Managing and Troubleshooting PCs
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CD-Digital Audio (CDDA) , which we usually just call CD-audio CD-audio divides the CD s data into variable-length tracks; on music CDs, each song gets one track CD-audio is an excellent way to store music, but it lacks any error checking, file support, or directory structure, making it a terrible way to store data! For this reason, The Powers That Be created a special method for storing data on a CD, called are you ready CD-ROM The CD-ROM format divides the CD into fixed sectors, each holding 2353 bytes Most CD-ROM drives also support a number of older, less known formats You may never come across these formats CD-I, CD-ROM/XA, and so forth although you may see them listed among compatible formats on the packaging for a new drive (Figure 1122) Don t let these oddball formats throw you with few exceptions, they ve pretty much fallen by the wayside All CD-ROM drives read all of these formats, assuming that the system is loaded with the proper software There are two other formats called CD-R and CD-RW perhaps you ve heard of them Well, I cover these in detail in a moment, but first I need to explain a bit more about CD-ROM The CD-ROM format is something like a partition in the hard drive world CD-ROM may define the sectors (and some other information), but it doesn t enable a CD-ROM disc to act like a hard drive with a file structure, directories, and such To make CD-ROMs act like a hard drive, there s another layer of formatting that defines the file system used on the drive At first glance, you might think, Why don t CD-ROMs just use a FAT or an NTFS format like hard drives Well, first of all, they could! There s no law of physics that prevented the CD-ROM world from adopting any file system The problem is that the CD makers did not want CD-ROM to be tied to Microsoft s or Apple s or anyone else s file format In addition, they wanted non-PC devices to read CDs, so they invented their own file system just for CD-ROMs, called ISO-9660 This format is sometimes referred by the more generic term, CD File System (CDFS) The vast majority of data CD-ROMs today use this format Over the years, extensions of the ISO-9660 have addressed certain limitations such as the characters used in file and directory names, filename length, and directory depth It s important to know these ISO-9660 extensions:
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Joliet Microsoft s extension of the ISO-9660 Macintosh and Linux also support Joliet formatted discs Rock Ridge An open standard to provide UNIX file system support for discs; rarely used outside of UNIX systems El Torito Added support to enable bootable CD-media All bootable CDs use the El Torito standard, which is supported by the BIOS on all modern PCs Apple Extensions Apple s added support for their HFS file system Windows systems cannot read these CDs without third-party tools
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It is important to appreciate that all of these file systems are extensions, not replacements to ISO-9660 That means a single CD/DVD can have both regular ISO-9660 information and the extension For example, it s very common to have a CD-media that is ISO-9660 and Joliet
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Figure 1122
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Crazy CD formats
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11: Removable Media
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If you place the CD into a device that cannot read Joliet, it will still be able to read the ISO-9660 information
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CD-ROM Speeds
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The first CD-ROM drives processed data at roughly 150,000 bytes per second (150 KBps), copying the speed from the original CD-audio format Although this speed is excellent for listening to music, the CD-ROM industry quickly recognized that installing programs or transferring files from a CD-ROM at 150 KBps was the electronic equivalent of watching paint dry Since the day the first CD-ROM drives for PCs hit the market, there has been a desire to speed them up to increase their data throughput Each increase in speed is measured in multiples of the original 150 KBps drives and given an to show speed relative to the first (1 ) drives Here s a list of the common CD-ROM speeds, including most of the early speeds that are no longer produced:
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1 150 KBps 2 300 KBps 3 450 KBps 4 600 KBps 6 900 KBps 8 1200 KBps 10 1500 KBps 12 1800 KBps 16 2400 KBps 24 3600 KBps 32 4800 KBps 36 5400 KBps 40 6000 KBps 48 7200 KBps 52 7800 KBps 60 9000 KBps 72 10800 KBps
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