Optionally associates itself with Rar files. Can extract several Rar archives at once. Can use one password automatically for multiple archive extractions of Rar files that are protected with the same password. Cool, fun interface. Absolutely free! Small in size to download and use [ around 2.5 MB ].
Active2 years, 4 months ago
I just learned about
.rev
files with WinRAR -- where if you have a 10-part RAR volume, for example, plus one .rev
(recovery) volume -- the .rev
volume will be able to 'fix' any one corrupted .rar
volume.How is this possible? I don't understand how one volume could have all the data to fix any/all of the individually broken volumes.
I'd guess that it's perhaps possible in lieu of the volumes not being broken up 'linearly', like I'm imagining, where each RAR volume holds distinct, individual files of the whole packed within; but rather, perhaps
.rev
repairing is possible when the RAR volumes are viewed as one continuous file of bits and bytes, so to speak, and that perhaps there's some CRC'ish sorcery (ah hem, 'repair work') involved to fix corrupted bytes.Playbook apps apk bar files free download. Convert your Android Apps & Games to Playbook & BlackBerry 10 compatible bar files with our online APK to BAR converter. To help identify whether an app is compatible with BlackBerry, we return a compatibility rating from 1 to 5, The lower the number, the more likely the app will work on your PlayBook or Blackberry phone. All converted files can be downloaded for free and ready to use on your PlayBook or BlackBerry.
But I just don't understand how you can have 9 working volumes with 1 damaged, yet have a recovery volume that can repair any one of the volumes. How is one volume able to hold data of 'all' the volumes?
Gypsy Spellweaver1,65511 gold badge66 silver badges2121 bronze badges
ColdblackiceColdblackice2,5941212 gold badges4242 silver badges6767 bronze badges
2 Answers
Lets take a really simple case.
You have four volumes and a recovery volume, each with 1 bit of information in it:
The recovery volume would contain the result of each of these bits XORd together:
So, our recovery volume contains the single bit
1
.Plus One Obvious Rar Extractor Mac
Now, lets say volume 1 fails.
Plus One Obvious Rar Extractor Free
If we XOR the remaining volumes 2, 3 and 4 with the recovery bit in place of the failed volume we get:
So, this tells us that volume 1 contained
1
, since it is the result of the equation.Let us pretend volume 2 died instead, so we replace it's value in the equation with the recovery bit:
So we know that volume 2 contained
0
, since it is the result of the equation.London calling to the imitation zone Forget it, brother, you can go at it alone London calling to the zombies of death Quit holding out - and draw another breath London calling - and I don't wanna shout But while we were talking I saw you nodding out London calling, see we ain't got no high Except for that one with the yellowy eyes. Rapidshare london calling band. The ice age is coming, the sun's zooming in Meltdown expected, the wheat is growing thin Engines stop running, but I have no fear Cause London is drowning and I, live by the river. EMD offers a premium experience that includes unlimited access to CD quality music. Download London Calling by The Clash The Clash London Calling lyrics London calling to the faraway towns Now war is declared - and battle come down London calling to the underworld Come out of the cupboard,you boys and girls London calling, now don't look to us Phoney Beatlemania has bitten the dust London calling, see we ain't got no swing 'Cept for the ring of that truncheon thing. Learn how to download music.
If volume 3 or 4 failed, they would both produce
1
in this equation.So, if any of the volumes failed, the recovery volume can be used to reconstruct the data based on the remaining volumes. This is probably the simplest form of error correction you can have. If two volumes failed, you can't recover anything.
Tamara Wijsman51k2525 gold badges165165 silver badges248248 bronze badges
PaulPaul49.8k1414 gold badges123123 silver badges152152 bronze badges
For a really simple way to understand how this could be, imagine if the recovery volume contained the sum of the other volumes. With a list of numbers, missing one of them, and their sum, you can always reconstruct the missing number.
Python ghostscript pdf to png. For example, consider these two digit numbers, 13, 88, 17, 43. If you knew that there was one missing number and the last two digits of the sum of all the numbers was 81, you could find the missing number. 13 + 88 + 17 + 43 = 161. The only two-digit number you can add to that to make a number that ends in 81 is 20.
Say you had the 20 and were missing the 43. 13 + 88 + 17 + 20 = 138. The only two-digit number you can add to that to make a number that ends in 81 is 43.
Thus the recovery number lets you find any one missing number.
David SchwartzDavid Schwartz
Plus One Obvious Torrent
57.4k66 gold badges8888 silver badges133133 bronze badges