0
votes
1answer
21 views

Compress / Zip a folder periodically but use minimal CPU?

Similar to this question except, I need it to run with minimal CPU on the background? Also, if there's a 7zip solution that will be nice.
3
votes
0answers
33 views

Compressed file with a header containing all files within it, at the beginning of the file

I have noticed that most files resulting from a compression / archive process do not have a list of the files contained at the beginning of the resulting file, but rather at the end of it. For ...
3
votes
1answer
33 views

Is there any solution/utilities to compress and upload a large file simultenously?

Upload a large file via broadband connection takes time. Compress the file using max. compression ratio before upload also consume time. Is there any solution that may compress and upload file to ...
0
votes
2answers
54 views

How can I achieve the maximum zip compression? [closed]

I would like to make a "standard" zip file which contain .jpg images. Which software and switches / options should I use to achieve the maximum compression ratio? I mean maybe I can make a solid ...
1
vote
1answer
50 views

Recursively process zip archives to extract files while discarding specific format of files

On my Windows 7 machine, I have a directory full of downloaded dumps in ZIP archives. Each archive contains few text files, PDFs and rarely XML files. I want to extract all the contents of each ZIP ...
6
votes
1answer
89 views

When putting two identical files in a .zip, they take 2x space, can this be avoided

Say that you have a file you want to put in a .zip archive: zip a1.zip foo.dll My test .dll file is ~10MB, and the archive turns out to be 3.5MB Then you create a file with the exact same ...
0
votes
0answers
28 views

Cannot complete the compressed folder extraction wizard

Recently my friend archived a folder in linux (Redhat) and uploaded in Google Drive. I have downloaded the .zip file and trying in it to unzip in windows 7. I am receiving following error: Cannot ...
0
votes
0answers
24 views

Why would my zipped file be the same size as the uncompressed files? [duplicate]

I am trying to zip 13 mp4s. The uncompressed versions of those files are 2.69GB. But when I zip them with 7zip, using Ultra compression level and any of the compression methods - including LZMA, the ...
0
votes
1answer
35 views

Should I extract before running?

Is it not wise to run an executable from a zipped file without extracting first? Someone explained to me that there is no need to extract first. He explained that zipped files are nothing more than ...
0
votes
0answers
38 views

Fast way to forward an Outlook email as a zip

I need to find a quick way to select an email in Outlook 2010 and forward the email as a zip attachment. The recipient will always be the same. The subject and body of the email will always be the ...
5
votes
1answer
134 views

Change Excel Zip Compression Level in Windows

Excel compresses its files using Zip-Deflate and stores it. However, the compression level is far from the best. To reduce the size and send it across I have to unzip and re-zip it manually everytime. ...
0
votes
1answer
34 views

Move data with compression

I'm using win 7.I have disk ~2Tb which one I want to format so I need to move data from it to other disk, but the problem is that I have not another 2Tb disk and I think I can compress data(on the ...
0
votes
0answers
21 views

While compressing the folder many other zip files creating during the process

I seen a strange thing never seen before while compressing the folder into the zip. When I start zipping my folder there are many zip files showing automatically during the process. Like say the ...
1
vote
0answers
66 views

Re-zip archives with the compression level “No Compression”

I am running Windows 8.1 Enterprise x64. I have a folder containing hundreds of ZIP archives (aka Compressed folders). I need the fastest way to convert them (preferably, in-place) to vaild ZIP ...
0
votes
1answer
183 views

Force all files in a NTFS compressed folder to automatically compress [Windows]

Is it possible to keep all the files within a NTFS-compressed folder compressed? For example, if I have a compressed a folder using NTFS compression, it will compress all the files inside the folder ...
0
votes
0answers
54 views

Unzip speed on Mac versus Linux

I have a zip file that contains 200mb of data, compressed to an 80mb .ZIP file. Basically it's a website with thousands of files, including code and images, no video. The file was zipped on a linux ...
3
votes
1answer
91 views

Is there a way to compress files at different compression levels inside a single 7zip file? [duplicate]

Some files are compressed using their own compression scheme and some aren't. If I try Max compression on an already compressed file, I'll get 1%-2% better compression at most. The amount of time ...
0
votes
1answer
200 views

zip sub folders individually

can anyone help me make a batch file for my problem. i have multiple folders that i want to compress individually. root folder 1 file 1 file 2 ...
0
votes
0answers
68 views

Zipping multiple folders individually

I have a problem zipping multiple folders individually. I saw that you can do that using Winrar. I have managed to do it. But here is the problem: When you extract the archive made by Winrar, it ...
2
votes
2answers
92 views

What other archive formats save Date Created and Date Accessed?

7-Zip on Windows will save the Date Created and Date Accessed when compressing a .zip file, however it does not do this for its native .7z format. Any Unix-based formats are ineligible. Are there any ...
0
votes
1answer
219 views

How to create ZIPs with the content of every folder [duplicate]

I have several folders and I need to compress the content of each folder in a separate ZIP file. However, every ZIP should only contain the content of each folder and not the folder itself. The ...
4
votes
3answers
2k views

Recursively unzip files where they reside, then delete the archives

I goofed up a setting on the backup software I use. Normally I would have the files from a network share get loaded into a spare drive, compressed into zip folders, then sent off to the offsite hub. ...
1
vote
2answers
97 views

How to extract such a compressed file?

I have been asked to extract a ZIP file having in it 3 tar files and each tar file contains around 3000 gz files. I had to extract the main ZIP file first then extract the tar files second then ...
0
votes
1answer
193 views

Differences between DMG and various Zip-like formats?

For my everyday work, I have a few DMG files that I keep on cloud storage. At the beginning of the day, I download my DMGs, convert them from Compressed to Read/Write using Disk Utility (OSX). At ...
0
votes
2answers
1k views

Zip many files into several archives

Running Linux. I have a directory of around 150 large CSV files; simply doing a zip -9 on them results in a monolithic file that is still too large. I would like it to simply zip them in maybe four or ...
0
votes
1answer
363 views

Is it possible to recursively list zip file contents with 7 zip without extracting

Similar to this question I have a very large zip file which contains other zip files, folders, and files. I want to use 7-zip to extract a list of file names from it, recursing into subfolders and zip ...
1
vote
2answers
3k views

Compressed (Zipped) Folders no longer extract properly

I actually just finished up cleaning a virus from my computer (took me in total like 20 minutes, no big deal), but I'm almost sure this is what caused the problem. Now, whenever I download a zipfile I ...
1
vote
3answers
665 views

powershell create zip from log files

How can I move log files to zip archives with System.IO.Compression.FileSystem in PowerShell? I have more folders with log files per application: app1logfolder |-app1_20130507.log ...
1
vote
0answers
1k views

“extra bytes at beginning or within zipfile,” won't open file

I have an 8.3 gig zip containing tons of telescope observation data, but I can't extract no matter what I try. I've tried Archive Manager, unzip, and tried this guy's fix: ...
0
votes
3answers
378 views

What is the equivalent unix command to a Mac OSX “Compress” menu action?

When I right-click a file in Mac OSX and select "Compress 'File Name'", what is the equivalent bash or terminal command to get the same result? Is it just gzip -9 /path/to/filename?
0
votes
1answer
890 views

Split a folder of files into multiple zip files based on size or # of files

My problem is that the file uploader I'm working with will only allow a zip file with a size of 10mb or less. Unfortunately, I have thousands of files that need to be processed and I do this by ...
2
votes
2answers
2k views

How to zip multiple folders in 7zip?

I have a folder, lets say, MAIN. Inside this folder, there are many folders(say f1,f2,f2...) which has subfolders and files in them. Now I need to zip these folders(f1,f2,f3...) and their contents ...
2
votes
1answer
250 views

How would Apache or Compressed HTTP react to a zip bomb?

inspired by Compress a 1GB file into 200_MB? and the related comments: Many webservers today use a zipped HTTP Version (Gzip afaik). How would Apache or any other server react to a zip bomb? Since ...
0
votes
1answer
395 views

Windows 7 extract and compress zip has been compromised by NCH's Express Zip program. How to fix?

I installed NCH's Express Zip, and now I can no longer use Windows 7's way of extracting and compressing. I would like to get rid of the NCH program and get back the original functionality of windows ...
0
votes
2answers
375 views

How to extract and erase the original compressed file on Windows 7?

I wonder whether there is an extractor tool that as well as extract the file contents, erase the original compressed file. Thank you.
0
votes
1answer
1k views

Is there a limit to compressed file size on Win XP?

I just compressed 11.6GB of data on my hard drive into a 4GB zip file using Windows XP Compressed Folders, and deleted the original data. I then found that the 4GB zip file is corrupt. Is this simply ...
1
vote
2answers
4k views

Compress files from OS X terminal?

In the Finder, there is this wonderful ability to right click on a file or directory, select compress from the drop-down, and end up with a zipped file. Is it possible to do the same thing from the ...
-1
votes
1answer
82 views

Why don't mp3 files use better compression techniques? [closed]

For instance, an mp3 can be losslessly compressed with 7zip to about 25% of its original size. I compressed an album and the whole thing is a 1/4 of the size. Each song is about a 1/4 of the size (a ...
0
votes
4answers
3k views

Why do large zip files become corrupted so often after downloading?

It seems that when I use a web browser to download a large zip file (2-4gb), I go to unzip it and viola, corrupted. This happens so often. Are browsers not reliable means to download a file (http) ? ...
0
votes
1answer
260 views

Create a zip file that doesn't create a folder when opened, Mac OS X

I am wondering if there is any way of easily creating a zip file that contains a bunch of files. However, when I double-click to open this zip file, I do not want it to create a subdirectory with the ...
0
votes
1answer
670 views

General Compressibility Of Various File Formats [closed]

Has anyone come across list of which file formats generally compress well (in general algorithms)? Generally, text files .txt compress well, and media-files (.mp3, .avi, etc) do not compress well. ...
0
votes
0answers
215 views

Is it possible to recover partial compressed files?

Of the most popular compression methods (7z, RAR, Zip, GZip) is there any of them that allows to retrieve the uncompressed data from a partial file? Imagine there is only one compressed file, and it ...
2
votes
3answers
2k views

Why does a zip file appear larger than the source file especially when it is text?

I have a text file that is 19 bytes in size and having compressed the file using zip and 7zip, it appears to be larger. I had a read of the question on Why is a 7zipped file larger than the raw file? ...
32
votes
5answers
3k views

Why is a 7zipped file larger than the raw file? [duplicate]

Possible Duplicate: Why doesn't ZIP Compression compress anything? I tried 7zipping an .exe file but it actually became larger. Is this the expected result?
2
votes
1answer
4k views

Identifiying a zip file that is not really a zip file

I have several files that a 3rd party program generated that have a .zip extension, however neither windows nor 7zip can extract it. In 7zip it does show me the file name of the uncompressed file ...
5
votes
5answers
12k views

Reduce .wav file size

I am required by a distance education language course to record some audio and submit it. However, they are being absolutely unreasonable. I am only allowed to attach a file that is 5mb while my ...
2
votes
1answer
1k views

Zip/gzip compression ratio much less in Linux than in Windows

I have a bunch of very huge files located on a Linux machine that I would like to compress and save some space. I have tried using the tar/gzip combination and I have noticed that the compression ...
0
votes
1answer
1k views

Unzip an archive that was split into 2 files

I have 2 zip files that were split using: zip -r -s 15 my_file.zip my_file.pdf Now I have 2 files: my_file.zip my_file.z01 How can I unzip them? Doing unzip my_file.zip I get: Archive: ...
3
votes
6answers
2k views

Zip files without compression

I'd like to bundle a number of big files into a single file, to make them easier to share. The files are already compressed (eg. jpeg, video etc), so I don't need compression, only archiving. How can ...
20
votes
4answers
2k views

Can Double Zipping Cause Problems?

I have a directory that I have been storing a ton of files in. Among the 10ish types of files there are also .zips of other directories. In my personal experience I vaguely remember issues when ...