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63Image file options
Image files and CRC32
Performance expectations on a network
One advantage of Norton Ghost is speed. Many factors affect performance. There
are ways to gauge whether Norton Ghost is running optimally.
When you use Norton Ghost across a network, use the fast compression option.
If disk space is at a premium, you can use higher compression, but it can affect
speed.
Image files and CRC32
Cyclic Redundancy Checking (CRC) is a data error checking technique. CRC
ensures that the original data written to the image file is the same as the data on
the disk. CRC32 is a CRC technique that uses a 32-bit value to store error
checking information.
When an image file is created, CRC32 details are embedded into the file to ensure
that image file corruption is detected when the image is restored to disk. CRC32
is currently included on a file-by-file basis with FAT partitions and on a volume
basis for NTFS partitions.
In addition to image file error detection, the CRC values are used to verify that
image files and partitions or disks are identical. This offers an additional method
to detect bad sector writes and other drive anomalies that may be missed during
normal imaging checks.
You can generate a text file that contains CRC values and associated file attributes
using the -CRC32 command-line switch.
See “Command-line switches” on page 153.
Image files and volume spanning
Images can be contained in a single file or spanned across a number of files.
Standard image files
Standard image files consist of a single file that contains the contents of the
complete disk or required partitions. This type of image file is stored on other
hard drives, tape, CD, or DVD drives where the volume is large enough to hold
the complete image file.