Questions tagged [crc]

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How to unstuff a stuffed bit packet? - High-Level Data Link Control

It seems there are a lot of references on how to stuff a bit sequence (known as bit stuffing), by using 0 as a delimeter after 5 consecutive 1, but not about how the receiver unstuffs those delimeters....
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13 views

Is it feasible to get a hash collision for CRC32, MD-5 and SHA-1 on one file? [migrated]

I'm aware that individually, each has its weaknesses (especially CRC32), but is it feasible that a file could be created to falsely match all three?
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1answer
21 views

Buying a used hard disk with Interface CRC errors

A guy on a forum has listed his 6TB Western Digital Red hard drive for sale. He has sold several products before and has a good track record so he is not a scammer. He has posted the following ...
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15 views

Addresing registers of device

This is my first experience with the modbus protocol. I decided to connect the control panel of my chilling device with my PC. I connected them with USR TCP232-410s device (control panel – RS485 then ...
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1answer
196 views

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 ...
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1answer
49 views

How can I get different SHA checksums for 'identical' iso files?

I have two ISO files, I call it Windows 10 ISO #1.iso Windows 10 ISO #2.iso The checksums calculated with different tools show two different values for this two *.iso files. The two textfiles show ...
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1answer
366 views

The IO operation at logical block was retried and CRC errors in S.M.A.R.T

I have a Samsung 850 Evo (250GB) SSD since December 2016 (2+years). In February this year my system started to lag and while digging in Event Viewer I saw Event 153 + CRC error count in SMART go up. ...
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254 views

CrystalDiskInfo showing an UltraDMA CRC Error Count of 5 - Have I lost any data?

CrystalDiskInfo tells me I have an UltraDMA CRC Error Count of 5. Does it mean I've lost data or that I have corrupted files on my hard disk ? Or were those 5 errors corrected ?
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1answer
26 views

How can I compare a full directory's checksum between platforms?

I have a directory full of files and subdirectories on a Win7 machine. I want to archive them, so I compress and move them to archival storage. Before compression, I use the CRC context menu to ...
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65 views

Reconstruct small file from hash values only [closed]

I am looking for if it's possible to losslessly recreate the original content of a text file only from a stored hash value (I prefer CRC checksum algorithm instead of others, because it's footprint is ...
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1answer
397 views

Fix for CRC Error

I have an SSD with a CRC Error. When I connect the drive to the PC, it does not appear as a drive (with associated drive letter) so I cannot run CHKDSK against it but it does appear in Disk Management....
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2answers
6k views

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 ...
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1answer
201 views

How do I fix my Windows 10 PC to normal condition after using a registry cleaner without backing up [closed]

I used CCleaner yesterday to delete registry entries that generated errors because I was getting a RunDLL error on my Windows 10 PC and I forgot to create a backup beforehand. When the RunDLL errors ...
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1answer
64 views

What's the granularity of CRC checks in bittorrent transfers like?

I don't think I've ever successfully used any torrent client in 20 years of trying once in a while. I'm in a backwater of the data world: I can get about 3000 bytes per second on a dialup connection ...
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3answers
3k views

What is the exact meaning of the QuickSFV comments at the end of an SFV file?

What are the QuickSFV comments at the end of an SFV file based on? 25-Monty_Python-The_End-EOS.mp3 D387716E ;Q1-1c11727069c13b6 ;Q1-///4AA== In version 2 it had a line more: cowiso-xvid-yrrol....
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1answer
125 views

How could I fix this CRC error?

How can I solve this CRC data error?
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1answer
4k views

Unable to format 64gb RAW SD card Cyclic Redundancy Check error [duplicate]

I recently purchased a new, Silicon Power high-quality micro-SD card. I used it multiple times as a boot disk for my Raspberry Pi, each time I burned a 4gb disk image and installed the OS, then ...
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1answer
917 views

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 ...
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1answer
70 views

Why did the designers of IP choose the IP Checksum? [closed]

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 ...
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1answer
2k views

Actual (current) value of UltraDMA CRC error count (SMART)?

I have some positive counts in UltraDMA CRC error count entry of SMART data on my HDD. How to know if this value is actual? It is possible related with bad cable I had previously. Does this counter ...
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0answers
1k views

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. ...
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1answer
204 views

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

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:...
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0answers
6k views

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 ...
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1answer
4k views

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,...
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1answer
5k views

Uncompressing a 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 ...
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1answer
502 views

Can setting the executable flag on an installation script lead to CRC check failure?

Recenty I have installed the VMWare Workstation for Linux on my Ubuntu machine and in the process of installation I have ran into a peculiar problem. The installer itself is some kind of archive that ...
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2answers
20k views

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 ...
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1answer
146 views

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 ...
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1answer
3k views

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 ...
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1answer
663 views

CRC Keeps Changing

I have a multi-file RAR archive with an SFV file which I have checked several times using a couple of different programs (QuickSFV and SFV Checker) and both keep changing their report each time I run ...
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4answers
8k views

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. ...
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1answer
1k views

Calculate SHA1 of CD-ROM on MacOS X

How do you calculate the sha1 of a CD-ROM disc under MacOS X? On Linux (RedHat) I use sha1sum /dev/cdrom. How do I do the same thing on Mac using openssl sha1?
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1answer
2k views

Windows 7 copy files dialog - option to replace on CRC mismatch?

Started using 7 : nice of them to ask me if I want my files to be replaced/skipped/renamed but very poor implementation : is there a way to tell windows to immediately replace files on CRC match and ...
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1answer
468 views

CRC error when extracting to SSD from 2nd HDD

I have a large RAR file (split up) containing an ISO on my 2nd HDD When I extract it: to the same HDD, it's OK to the system/OS SSD, I get CRC errors I've checked memory, run memtests, checked ...
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44 views

files that cannot be transfered from dvd to removable drive

what is the solution if there is always an error while transferring a file->data error:crc I tried to play the video file which cannot be transferred and it can be played from the dvd but when I try ...
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3answers
5k views

Force copy files off CRC error filled hard drive

So I have a dying Western Digital hard drive and I have a new Western Digital hard drive that I want to transfer all the data to. I have the new HDD hooked up by a SATA to USB adapter. I want to ...