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Ask experienced techs, What is the most expensive part of a PC and they ll all answer in the same way: It s the data You can replace any single part of your PC for a few hundred dollars at most, but if you lose critical data well, let s just say I know of two small companies that went out of business just because they lost a hard drive full of data Data is king; data is your PC s raison d tre Losing data is a bad thing, so you need some method to prevent data loss Now, of course, you can do backups, but if a hard drive dies, you have to shut down the computer, reinstall a new hard drive, reinstall the operating system, and then restore the backup There s nothing wrong with this as long as you can afford the time and cost of shutting down the system A better solution, though, would save your data if a hard drive died and enable you to continue working throughout the process This is possible if you stop relying on a single hard drive and instead use two or more drives to store your data Sounds good, but how do you do this Well, first of all, you could install some fancy hard drive controller that reads and writes data to two hard drives simultaneously (Figure 838) The data on each drive would always be identical One drive would be the primary drive and the other drive, called the mirror drive, would not be used unless the primary drive failed This process of reading and writing data at the same time to two drives is called disk mirroring If you really want to make data safe, you can use two separate controllers for each drive With two drives, each on a separate controller, the system will continue to operate, even if the primary drive s controller stops working This super-drive mirroring technique is called disk du(Figure 839) Disk plexing duplexing is also much faster than disk mirroring because one controller does not write each piece of data twice Even though duplexing is faster than mirroring, they both are slower than the classic one drive, one controller setup You can use multiple drives to increase your hard drive access speed Disk striping (without parity) means spreading the data among multiple (at least two) drives Disk striping by itself provides no redundancy If you save a small Microsoft Word file, for example, the file is split into multiple pieces; half of the pieces go on one drive and half on the other (Figure 840).

of Trust Measurement (SRTM) to provide a high level of tamper detection to early boot code This, combined with integrated disk encryption, provides the most resilient dataat-rest operating system solution ever offered for a Windows environment Access to data on the protected operating system volume is possible if the TPM successfully validates the integrity of early boot components on the protected drive The default TPM platform validation profile secures the VMK against changes to the MBR code (workstationR 4), the New Technology File System (NTFS) boot sector (workstationR 8), the NTFS boot block (workstationR 9), the NTFS boot manager (workstationR 10), and the volume key and critical components (workstationR 11) This process is shown in Figure 10-2 The Vista loader searches for usable keys for each enrolled option in turn until it finds a key that can decrypt the volume When a BitLocker-enabled operating system volume boots, BitLocker attempts to unlock a volume in this sequence: 1 Clear key: Protection has been disabled and the VMK is freely accessible No authentication is necessary 2 Authentication without user input: TPM: The TPM successfully validates early boot components to unseal the VMK TPM plus startup key: The TPM successfully validates early boot components, and a USB flash drive that contains the startup key is inserted TPM plus personal identification number (PIN): The user must enter the correct PIN before the TPM can be successfully validated Recovery key and/or startup key: The user must insert the USB flash drive that holds the recovery key or startup key Recovery password: The user must enter the correct recovery password

Mike Meyers CompTIA A+ Guide: PC Technician (Exams 220-602, 220-603, & 220-604)

To create a new custom class definition, right-click the project, select Add | Class, name the class Employee for this example, and type the file extension cs for C# or vb for VB; then click Add (VS will add this file extension for you if you don t) You ll see a file with the same code as Listing 3-1

3 Authentication that requires user input:

The one and only advantage of disk striping is speed it is a fast way to read and write to hard drives But if either drive fails, all data is lost Disk striping is not something you should do unless you re willing to increase the risk of losing data to increase the speed at which your hard drives save and restore data Disk striping with parity , in contrast, protects data by adding extra information, called parity data, that can be used to rebuild data should one of the drives fail Disk striping with parity requires at least three drives, but it is common to use more than three Disk striping with parity combines the best of disk mirroring and plain disk striping It protects data and is quite fast The majority of network servers use a type of disk striping with parity

using using using using System; SystemCollectionsGeneric; SystemLinq; SystemText;

A couple of sharp guys in Berkeley back in the 1980s organized the many techniques for using multiple drives for data protection and increasing speeds as the redundant array of independent (or inexpensive) disks (RAID) They outlined seven levels of RAID, numbered 0 through 6

In selecting which devices might require encryption, look to your corporate security policy Generally speaking, a good candidate device for BitLocker is one that has valuable data where the loss or revelation of that data would have a significant, negative impact on the company, its customers, shareholders, or staff

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