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10: Implementing Hard Drives
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drives within the extended partition Dynamic disks simplify the process by treating all partitions as volumes, so you can make as many as you need Spanned volumes use unallocated space on multiple drives to create a single volume Spanned volumes are a bit risky if any of the spanned drives fails, the entire volume is permanently lost Striped volumes are RAID 0 volumes You may take any two unallocated spaces on two separate hard drives and stripe them But again, if either drive fails, you lose all your data Mirrored volumes are RAID 1 volumes You may take any two unallocated spaces on two separate hard drives and mirror them If one of the two mirrored drives fails, the other will keep running RAID 5 volumes , as the name implies, are for RAID 5 arrays A RAID 5 volume requires three or more dynamic disks with equal-sized unallocated spaces
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The partition types supported by Windows are not the only partition types you may encounter other types exist One of the most common is called the hidden partition A hidden partition is really just a primary partition that is hidden from your operating system Only special BIOS tools may access a hidden partition Hidden partitions are used by some PC makers to hide a backup copy of an installed OS that you can use to restore your system if you accidentally trash it by, for example, learning about partitions and using a partitioning program incorrectly A swap partition is another special type of partition, but it is only found on Linux and BSD systems A swap partition is an entire partition whose only job is to act like RAM when your system needs more RAM than you have installed Windows has a similar function called a page file that uses a special file instead of a partition Most OS experts believe a swap partition is a little bit faster than a page file You ll learn all about page files and swap partitions in 13
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Early versions of Windows (3x and 9x/Me) called the page file a swap file Most techs use the terms interchangeably today
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Partitioning is not a common task The two most common situations likely to require partitioning are when you re installing an OS on a new system, and when you are adding a second drive to an existing system When you install a new OS, the installation CD will at some point ask you how you would like to partition the drive When you re adding a new hard drive to an existing system, every OS has a built-in tool to help you partition it Each version of Windows offers a different tool for partitioning hard drives For more than 20 years, through the days of DOS and early Windows (up to Windows Me), you used a command-line program called FDISK to partition drives Figure 106 shows the FDISK program Windows 2000 and Windows XP use a graphical partitioning program called Disk Management (Figure 107) Linux uses a number of different tools for partitioning The oldest is called FDISK yup, the exact same name as the DOS/Windows version However, that s where the similarities end, as Linux FDISK has a totally different command set Even though every copy of Linux comes with the
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Figure 106
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Linux FDISK, it s rarely used because so many better partitioning tools are available One of the newer Linux partitioning tools is called GParted GParted is graphical like Disk Management and is fairly easy to use (Figure 108) GParted is also a powerful partition management tool so powerful that it also works with Windows partitions Traditionally, once a partition is made, you cannot change its size or type other than by erasing it You might, however, want to take a hard drive partitioned as a single primary partition and change it to half primary and half extended Before Windows 2000, there was no way to do this nondestructively As a result, a few third-party tools, led by Symantec s now
This chapter explains how to partition a hard drive before it explains formatting, because that is the order in which you as a PC tech will actually perform those tasks You ll learn all the specifics of the various file systems such as FAT32 and NTFS when I explain formatting in the next section, but until then, just accept that there are several different systems for organizing the files on a hard drive, and that part of setting up a hard drive involves choosing among them
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