Compression decreases the size of data.

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1answer
626 views

How to see compressed and actual size of files on a compressed drive?

I'm using Windows 7 and installed a hard disk. When I formatted it I checked the option to enable file compression. I copied some files onto the hard drive. How can I see things like the ...
2
votes
1answer
4k views

How to compress .pdfs in word 2007?

I am trying to send my cover letter and resume away but apparently it is too big to send through craigs list(my computer says the total size is 500kb) as it has a 600kb limit(so small should be at ...
12
votes
1answer
242 views

Three formats? Why?

I needed to download the Ruby Source recently from here and it says, "available in three formats" which are .tar.bz2, .tar.gz and .zip. Is there any reason that we need all three formats? At least on ...
2
votes
3answers
13k views

How can I remove the password protection from a RAR archive? [duplicate]

I have a directory in which there are lots of password protected .RAR files/archives. The passwords of these individual archives are known. I want to remove the password protection from all of them ...
2
votes
2answers
200 views

Looking for archive tool with very simple command line usage

OS: Windows XP Requirements: Support compress/uncompress zip format Like gzip can use the original file name as archive file name, so no need to specify archive file name. gzip target_folder, so ...
0
votes
1answer
750 views

use Windows file compression on removable drive

I have a USB drive formatted with NTFS. I would like to use "compress contents to save disk space" option, although it is greyed out. It works fine on the C: drive. Any suggestions?
1
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2answers
195 views

Files being uncompressed faster than physicaly allowed by hard drive?

I recently got my new computer at the university and it is blazing fast. However when I decompress certain types of files, the computer says I'm decompressing them at over 200MB/s, which is way faster ...
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2answers
1k views

How to 7za file without specify archive name

Say have an executable target.exe, is there any way to compress this file into target.zip without specify archive name(output name) by using 7zip command line?
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2answers
1k views

UPX and .NET executables

Can UPX (upx.sourceforge.net) compact .net executables/dlls ?
2
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1answer
234 views

Compress latest kernel with upx

I'm just curious, how to compress latest (2.6.32 at time of writing) kernel using UPX? It worked well for older kernels but now repacked with UPX kernel fails to boot, standard compression methods ...
5
votes
3answers
690 views

How can I remove empty paths from a zip file?

I have a zip file that contains a empty path, which I want to be rid of. How can I clear it, while maintaining the rest of the zip? When I open the item in winzip I cannot see the empty file, but ...
4
votes
1answer
355 views

How to see just content of ZIP/RAR etc withoud downloading?

How to see just content of ZIP/RAR etc without downloading? for example like this http://dev.novemberborn.net/sifr3/nightlies/
3
votes
4answers
246 views

Scripting compression (ZIP or TAR) to be done in chunks

I'm trying to find a utility or approach out there that will allow me to compress an entire directory into chunks. I know it's easy to specify, for example, that the archive files created should be ...
21
votes
6answers
24k views

Is it possible to open a self-extracting compressed Windows file on a Mac?

If I have a compressed file that's stored as a self-extracting archive for Windows, i.e., a .exe file, is it possible to convert it to a zip file that can be unzipped under OS X? Alternatively, is ...
5
votes
3answers
2k views

What file compression application is the most space-efficient?

I have a bunch of directories that I want to keep, but I also want to clear out storage on my drive. What is the most efficient (in terms of compression ratio) compression application? I don't care ...
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vote
4answers
1k views

Performance Decline after compressing entire C: drive

Hey guys, i recently tried to improve performance in my laptop by compressing files on the c: drive... however due to my own negligence i compressed the entire c: drive and not just the my documents ...
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votes
8answers
4k views

Winrar-like archive utility for OS X

I've been a Mac user for about 1.5 years and so far enjoyed the experience. But one thing I miss from other operating systems is the lack of compression/decompression utilities that follow the ...
3
votes
1answer
2k views

Compress old mail with Apple Mail

I have 14GB of email (close to 1 million messages) on my Mac that I want to take up less space while still being able to reference "archived" messages. I have a set of folders that are effectively ...
3
votes
4answers
612 views

How to avoid compressing compressed files

Most compression programs compress all files by default. But when archiving a folder containing already compressed files, there is no need to compress them a second time, such as archives, packed ...
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5answers
8k views

How to set Mac OS X's Default Compression Format?

Mac OS X uses zip as it's default compression format. It makes this conveniently available from the contextual menu (control-click/right-click). I'd like to adjust this default to bzip2. I can do ...
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2answers
1k views

selfextracting archive with 7zip via cmd.exe

I downloaded 7za.exe and did this to compress a file.exe: 7za.rar a -mx9 archive file.exe Now I want to create a selfextracting archive (.exe), so I tried this: 7za.rar a -mx9 -sfx archive ...
6
votes
3answers
24k views

How to extract a gpg file

I have a file that is compressed. I used a program to find out what kind of file it is and it says that it's a gpg file. How do you uncompress a gpg file?
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vote
4answers
656 views

Finding out what a file is

I have a compressed file but I don't know what it's compressed with. The extension doesn't give any clue. How can I find out what it is?
1
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5answers
829 views

Is there a simple encrypting archiver which is just like WinZip except for the glaring security hole?

I find it quite annoying that WinZip (and 7-zip, etc) does not encrypt the file names in the archive, just the file contents. This is a glaring security hole as the file & folder names can ...
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6answers
1k views

Is there a free way to compress a PDF?

I have several PDFs that are quite large (one is 80+ MB). Is there a free way to compress that PDF to a smaller size?
13
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5answers
16k views

What is the quickest, easiest way to compress a mp3 file?

I would like to compress an mp3 file, and I see a lot of references when searching google, but it seems like by now someone must have found something easy and that is guaranteed to work. Compressing ...
0
votes
1answer
407 views

Compress and Upload vis SSH?

Is it possible to compress several folders and upload to another location (ftp) remotely? I've a GoDaddy account with SSH access, and I'd like to create a backup (zip all folders) and upload directly ...
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2answers
1k views

How are images stored within a PDF?

The are places that prefer PDF's for printing, and we've also been using PDF as a distributable format that "everyone can open". It's very easy on a mac to save as PDF (or go to "print" and save it ...
2
votes
1answer
874 views

how supercompressed iso files are working

I am recently seeing "Super Compressed" ISO files which have claimed to compress iso files to sizes < 15 mb, where the original file size is in 4GB+. How is it possible?
23
votes
5answers
15k views

How can I open a .7z file in Ubuntu?

How can I open a .7z file in Ubuntu?
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vote
4answers
32k views

Commandline to zip a file using WinRar

I looked for the answers in the list and did not find any matching. What is the commandline to zip a file using Winrar, and then move it to a particular folder?
12
votes
4answers
2k views

Why is a FLAC encoded from a decoded MP3 bigger than the MP3?

To be more precise than in the title, suppose I have a MP3 file that is 320 kbps. If I decompress it, then logically, all the data except for roughly 320 kilobits out of each second of audio should be ...
16
votes
5answers
32k views

Windows Disk Cleanup: “Compress old files” option

Should I check "compress old files" option while performing disk cleanup on Windows XP? What are the pros and cons? Likewise, there is another option in Local Disk Properties window: "Compress drive ...
2
votes
3answers
4k views

Further compression of disk image files

Is there a way to further compress a disk image file created by the disk utility program on macs? I need to fit a 6.5G/5.5G image onto a 4.7G disk.
2
votes
1answer
2k views

Linux - Is there a way to mount a compressed file that is not an archive?

It's possible to mount a compressed archive in Linux as if it were a directory using tools like archivemount or gvfsd-mount, both of which depend on libarchive. This only works for "proper archives", ...
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3answers
4k views

Is there a way to determine the decompressed size of a .bz2 file?

Is there a way to print the decompressed size of a .bz2 file without actually decompressing the entire thing?
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8answers
46k views

What’s a good way to extract .rar files on the Mac? [closed]

Anything built-in? (E.g. command line tools.) Any well-regarded software? Update: I like The Unarchiver, but vote up your favourite, or add it as an answer if it isn’t there.
3
votes
3answers
343 views

Opening up a .tar file on Windows

What Windows tool or program can I use to open a .tar file? I also have .tar.gz files that I would like to open.
23
votes
4answers
44k views

Create a tar file for compressing files and directories on Mac OS X

I'm new to Mac OS X and am not sure how to do this: I have three directories. I want to create a tar/zip file of them so that I can attach them to an email. Any ideas?
4
votes
3answers
2k views

What are the differences between the various video formats?

MP4, WMV, AVI, OGG, etc. What are the differences between them, how supported are they in different platforms, and what are the advantages of each one?
17
votes
2answers
29k views

Is it possible to execute a file after extraction from a 7-Zip self-extracting archive (SFX) archive?

I'm try to make a compressed deploy-able application. Currently I'm taking a set of files that I've published from my IDE (Visual Studio 2008 - WPF published application) and compressing ...
0
votes
5answers
3k views

Does compressing files in XP slow things down?

I frequently run the Disk Cleanup tool and let it compress old files. However, one of the directories it compressed, full of small icon images, is terribly slow. Is this a result of the compression or ...
2
votes
4answers
3k views

Tool for compressing data in JPEG lossless format [closed]

I have a file which contains raw pixel data and I want to compress this data using JPEG lossless compression. I tried to search for this tool using google but couldn't fina any. Does anybody know here ...
4
votes
4answers
855 views

More efficient file compression program for many identical files?

I am doing a backup of my work and I'm looking for a program that can more efficiently compress files. The windows default compression program works fine, but it doesn't work as "smart" as i would ...
4
votes
1answer
4k views

How do I setup Task Scheduler in Windows 7 to compress a folder using 7-Zip File Manager?

I would like to get 7-Zip Manager to zip my wwwroot folder on a weekly basis. Is it possible to automate this with Windows 7 Task Scheduler, and if so, what are the exact steps to do this?
7
votes
5answers
4k views

How to open corrupted ZIP files?

How can I open (or repair) corrupted ZIP files on Windows? Is there a way to force 7-Zip to open them?
0
votes
6answers
1k views

A compression program that handles files with unusual extensions

WAR files are simply ZIP files with a renamed extension. I'd like to configure a compression program to handle these (on double-clicking the file), but mine doesn't recognize them unless I rename them ...
2
votes
5answers
9k views

Is there a way to use the built-in Windows file compression tool on the command line?

Instead of using Right-Click/Send To/Compress (Zipped) Folder. I am using Windows Server 2003 Enterprise Edition.
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vote
4answers
338 views

Scanned JPEGs are large and slow to load - can they be optimized losslessly?

I have hundreds of JPEG photographs which were scanned about 5 years ago from negative using a Konica Minolta DiMAGE Scan Dual IV. The dimensions are ~4500x3000, and the filesize is around 12Mb, ...
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votes
4answers
2k views

Good and free unzipping software for Mac? [closed]

What is a good and free unzipping software for Mac? Good as in...supporting different types of compressed files and can unlock password protected ones. The built-in one on Mac doesn't do a good job ...