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In the author s informal experiments, enabling ReadyBoost on a 1-GB flash drive on
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a laptop computer with a WEI disk rating of 3.7 decreased Windows startup times by more than 30 percent. Gains on computers with a WEI disk rating of more than 5 were minimal.
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ReadyBoost creates a disk cache file named ReadyBoost .sfcache in the root of the flash drive . The file is immediately created for the full size of the specified cache; however, Windows will gradually fill the space with cached content . To monitor ReadyBoost performance, use the System Tools\Performance\Monitoring Tools \Performance Monitor tool in the Computer Management console and add the ReadyBoost Cache counters . These counters enable you to monitor how much of the cache is currently being used and when the cache is read from or written to . It does not tell you exactly what performance benefit you are achieving by using ReadyBoost, however .
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BitLocker Drive Encryption is a new Windows Vista and Windows 7 feature that improves data integrity and confidentiality by encrypting entire volumes . Windows Vista must have Service Pack 1 (SP1) installed to encrypted non-system volumes . BitLocker can use Trusted Platform Module (TPM) security hardware to wrap and seal the keys used to encrypt the system volume, helping to protect the volumes from offline attacks . Alternatively, BitLocker can use a USB flash drive to store the startup key used to encrypt the volumes . BitLocker is available in the Enterprise and Ultimate Editions of Windows 7 .
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BitLocker should be used with a TPM when used to encrypt the system volume . A TPM is a hardware module embedded in the motherboards of many new laptops and some desktops . TPM modules must be version 1 .2 for use with BitLocker . If a TPM 1 .2 module is not available, computers can still take advantage of BitLocker encryption technology on system volumes as long as the computer s BIOS supports reading from a USB flash device before the operating system is loaded . However, you cannot use BitLocker s integrity verification capabilities without a TPM 1 .2 module . Unlike EFS, BitLocker can encrypt entire volumes, including the page file, hibernation file, registry, and temporary files, which might hold confidential information . EFS can encrypt only user files . Additionally, when used with TPM hardware, BitLocker can help protect your system integrity by ensuring that critical Windows startup files have not been modified (which might occur if a rootkit or other malware was installed) . Also, if the hard disk is moved to a different computer (a common method for extracting data from a stolen hard disk), the user will be forced to enter a recovery password before gaining access to the protected volumes .
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BitLocker encrypts entire volumes . The contents of the volumes can be decrypted only by someone with access to the decryption key, known as the Full Volume Encryption Key (FVEK) . Windows 7 actually stores the FVEK in the volume metadata; this is not a problem because the FVEK itself is encrypted using the Volume Master Key (VMK) . Both the FVEK and the VMK are 256 bits . The FVEK always uses AES encryption to protect the volume . By editing the Computer Configuration\Administrative Templates\Windows Components\BitLocker Drive Encryption\Choose Drive Encryption Method And Cipher Strength Group Policy setting, you can set the specific AES encryption strength to one of four values:
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AES 128 bit with Diffuser (this is the default setting) AES 256 bit with Diffuser (this is the strongest setting, but using it might negatively affect performance) AES 128 bit AES 256 bit
For more information about the encryption algorithms used and the use of
MoRe inFo
diffusers, read aES-CBC + Elephant Diffuser: a Disk Encryption algorithm for Windows Vista, at http://download.microsoft.com/download/0/2/3/0238acaf-d3bf-4a6d-b3d60a0be4bbb36e/bitLockerCipher200608.pdf.
Windows Vista and Windows 7 encrypt and decrypt disk sectors on the fly as data is read and written (as long as it has access to the FVEK) using the FVE Filter Driver (Fvevol .sys) . As shown in Figure 16-12, the FVE Filter Driver, like all filter drivers, resides between the file system (which expects to receive the unencrypted contents of files) and the volume manager
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