dection 5Storage Devices.docx

Dynamic disk also allows you to create raid arrays

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Dynamic disk also allows you to create RAID arrays, where basic disks don't. Dynamic disks are very powerful. Summary 14:17-14:39
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So, that's it for this lesson. Let's review the main points we've talked about. We learned about the relationship between hard disks, partitions and volumes. We began by talking about the different types of partitions that you can create on a hard disk drive. We talked about primary partitions, extended partitions, and logical partitions. And then we talked about the different types of volumes you could create, like basic and dynamic volumes. A partition is a logical division of the storage space on a hard disk drive. Partitions are identified by 16-bit entries that make up the partition table located in the master boot record (MBR) of that drive. A hard disk can contain a single partition that encompasses the entire drive or multiple partitions that divide up the storage space on the hard disk drive. Windows supports two different kinds of disks: basic and dynamic. The disk type controls characteristics about how partitions and volumes are defined. Disk Type Description Basic Basic disks have the following characteristics: Basic disks use primary and extended partitions. o Each physical disk can have up to four primary partitions or three primary partitions and one extended partition. o Logical drives are defined within an extended partition. You can have up to 24 logical partitions on an extended partition. The extended partition can be divided into multiple logical drives. You must create a logical drive in an extended partition before you can format and store data (the logical drive, not the partition is the storage unit). Basic disks are supported by all operating systems. A basic disk only supports volumes made up of contiguous disk space. Basic disks store partition information in a portion of the master boot record (MBR) known as the partition table. o The partition table has room for up to four partition entries (hence the limitation on the number of primary partitions). o When an extended partition is used, one of the four entries points to an extended boot record (EBR). The EBR is located within the extended partition and contains information about the logical drives within the extended partition. Dynamic Dynamic disks have the following characteristics: Volumes on dynamic disks are like partitions and logical drives on basic disks. Dynamic disks support up to 128 volumes. Dynamic disks support volumes that use discontiguous disk space. o Simple volumes contain disk space from a single hard disk (either contiguous or discontiguous space). o Spanned volumes contain disk space from multiple hard disks, grouped together into a single logical volume. Dynamic disks store partitioning information in a hidden database on all dynamic disks in the system.
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