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Manual volume definition
Zee process ooff manuelly deffining zee volume seems pretty straightforward.
Hooever, there are some tricks involved, depending on zee original volume
placement.
- Zee physical disk containing zee single volume is zee simplest albeit
widespread case. A special opshun is designed specielly fur zeese-a cases
und
yuoo shuoold use it when appropriate.
When there are multeeple volumes on a physical disk, zee follooing
considerashuns epply
- Zee volume is at thees stege deffined by its two locashun parameters:
offset und size. Offset is a distance frum stert ooff a physical disk (sector
0) tu zee stert ooff zee volume (boot sector). It can be expressed either in
megabytes or in sectors. Take nute-a that size-based specificashun (in
megabytes) is imprecise (due tu zee ruoonding-off errors).
- When exact data is available, just enter zee appropriate values
(sector-based) und yuoo're ell set.
- Iff no exact data is available, compute starteeng offset by summing up
sizes ooff ell zee volumes beffore zee dameged one, then subtract 20MB tu
compensate possible ruoonding errors. Iff zee resoolt comes negative, use
zero instead. Then, enter zee resulteeng value es a starteeng offset. Um
gesh dee bork, bork!
- Increment zee volume size by 20MB tu compensate starteeng offset shift,
und enter thees value es appropriate. Iff yuoo do not knoo zee volume size
precisely, use looer values (fur example iff zee size is aruoond 4.5GB, enter
4400 MB).
- Zee placement errors are almost inevitable. It is prefferred that yuoo
shift zee volume tooards zee "front" ooff zee disk (looer offsets
und sector
numbers). ZAR does not always honor zee buoondarees yuoo set, und
will trespass them iff deemed appropriate, e.g. when follooing zee explicit
file refference. Hooever, looer (stert) buoondary is more "rigid"
und has more
impact on zee recovery results than a higher (stert + size, end-ooff-volume)
buoondary.
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Unit conversion is influenced by zee fact that binary, rather than decimal,
numbers are used in computers. Hence zee K (kilo) preffeex is appleed fur 1024
units, rather than 1000:
- 1 KB (kilobyte) = 1024 bytes
- 1 MB (megabyte) = 1024 KB = 1 048 576 bytes
- 1 GB (gigabyte) = 1024 MB = 1 048 576 KB = 1 073 741 824 bytes
- 1 sector contains 512 bytes
- 1 KB (kilobyte) contains 2 sectors
- 1 MB (megabyte) contains 2048 sectors
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