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Questions tagged [crc]

44 questions
32
votes
2 answers

How is it possible that WinRAR can repair any volume with one .rev file?

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…
Coldblackice
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13
votes
6 answers

What can be causing my tremendous amount of FEC and CRC errors via my DSL connection?

I am using Windows 7, Intel core processor, I7-4770K CPU @ 3.50 GHz, 64-bit operating system and 8 GB of RAM and for over 6 weeks I have been having intermittent disconnections — FEC and CRC errors almost daily — from the internet which prompted my…
Mark
  • 181
13
votes
7 answers

Any Built-In Checksum utility for Windows 10 using CRC-32?

Is there any Built-In Checksum utility for Windows 10 using CRC-32? I checked different answers which are old and mention certUtil, but that does not support CRC-32 or CRC-64. Update: I had also checked Is there a built-in checksum utility on…
Umair Malhi
  • 231
10
votes
1 answer

Does Windows calculate CRCs to check every file operation?

When Windows encounters a file corruption on a file system, it may return the following error message: Data error (cyclic redundancy check). This suggests Windows checks every file operation (copy, move, etc.) by calculating CRCs. Does Windows…
bwDraco
  • 46,683
8
votes
4 answers

What may cause very high CRC errors on SSD (Apart from bad SATA cables, if any)?

My SATA SSD, in a span of about 2 years has developed over 37K CRC errors. These have not linearly increased. There have been just 3 -4 instances where Windows hung and later after inspecting SMART parameters I found a substantial increase in the…
rajeev
  • 1,984
3
votes
0 answers

Files get corrupted frequently while copying to external hard drives

I'm running Windows 7 64 bit (updated all important updates yesterday) and have several external usb hard drives (self powered 3.5 inch). I recently noticed while copying files to the external drive and then using a utility to compare the original…
Coder
  • 495
3
votes
1 answer

Any way to recover a file with bad blocks (CRC error in Windows)?

What I see is this: Windows complains when reading a file because the CRC for it mis-matches its calculated CRC. This means NTFS has a CRC for the file. I expect the offending block/sector can be known, or at least guessed. I also expect that…
Camilo Martin
  • 2,794
2
votes
3 answers

Uncompressing a ZIP file despite CRC errors

I have downloaded a multipart ZIP archive. It contains a video file. Unfortunately, IZarc reports a CRC check fail when extracting the archive. Downloading the archive again is a long task, since I used a freemium digital locker and JDownloader, it…
usr-local-ΕΨΗΕΛΩΝ
  • 4,862
2
votes
1 answer

Extract hash values (CRC) and path names from an archive

I have successfully extracted data from a large .rar archive (1.9TB) using 7-zip and now I want to delete the archive. However, before I do so, I would like to save path names and, most importantly, the corresponding CRC values that are listed in…
an531
  • 95
1
vote
1 answer

add hash to a file using command line

I am writing a Windows batch file to copy a file from my computer to a network location, but before doing this, I need to add a hash for it using the command line. Assuming that my file is named testing.zip, how can this be done?
Scorpion99
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1
vote
1 answer

Why did the designers of IP choose the IP Checksum?

Why did the designers of IP (and UDP and TCP) choose to use the IP checksum to detect errors rather than a more robust error detection code such as CRC-32? I previously thought the IP checksum was chosen because it was fast and cheap to recalculate…
user376151
1
vote
0 answers

Lenovo IdeaPad y510p, MATSHITA DVD-RAM results CRC error while coping 7GB file from Double Layer DVD

I Have Ideapad y510p with MATSHITA DVD-RAM UJ8DB. While I tring to copy 7GB file do HDD almost in the middle (after 42%) it stucks and after a while it prompt that file can't be copied due to error. In fact I tring to install a game so when it does…
Ziemo
  • 111
1
vote
1 answer

File copy software that first checks for errors and than copies only undamaged files?

I'm trying to copy files from a damaged HDD to a fine one (both connected via USB 3.0 under Windows 8.1) but I'm having a hard time since it's more than 1TB of data. I'm using robocopy with r:0 and w:0 but when a file with CRC error is found the…
user2163438
  • 11
1
vote
1 answer

File extraction errors

I have a gigabyte 970 motherboard. A 64 gb SSD, a 1tb HDD and an AMD fx6200 CPU. Graphics AMD Radeon hd 6870. 8 gb ram. Nothing is overclocked, everything is stock. So I downloaded a few large archives (saved to the hdd) and I extracted them…
Trevor
  • 11
1
vote
4 answers

How to fix CRC errors on external hard drive

I was transferring a 2 GB file from my desktop to an external hard drive. But I accidentally restarted the computer. Now I'm getting CRC errors, and I can't access what's on the hard drive. Windows 7 always says that I format the drive. Is there a…
Wern Ancheta
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1
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