Compression decreases the size of data.

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44
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4answers
25k views

How does NTFS compression affect performance?

I've heard that NTFS compression can reduce performance due to extra CPU usage, but I've read reports that it may actually increase performance because of reduced disk reads. How exactly does NTFS ...
12
votes
6answers
9k 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 ...
0
votes
2answers
327 views

Compressing Notebook Files

I need to compress and upload a Smart Notebook 10.8 file for uni along with hundreds of other students! Even though the file is only 3.7 MB, I am still having trouble making it smaller. Can you help?
2
votes
1answer
999 views

What's the quickest way to a minify a SQL file from the command line?

I want to run a single batch command that must take mySQLfile.sql and compress it by minifying it. Any suggestions on how to get mysqldump to produce the most compressed SQL file? It would be cool if ...
0
votes
1answer
4k views

How can I compress a movie to a specific file size in Windows 7's Live Movie Maker?

In previous versions of Windows Movie Maker I could take a raw video file and specify the file size to compress it to, and Movie Maker would compress it accordingly (with the appropriate loss in ...
1
vote
1answer
169 views

pdf compressor on Win 7

I would like to know a preferably free software to compress PDFs on Win 7 so that I can email them. I came across this one, but it requested that I enable User Access Control so I am a bit wary.. ...
1
vote
7answers
40k views

Can I compress a RAR file again to reduce its size?

I had a 326 MB iso file that I compressed using WinRAR, with the best compression method. It got compressed to 144 MB. I want to compress more and want it to be limited to something around 22 MB. ...
1
vote
1answer
550 views

Copying a large number of small text files between two servers over WAN

We have a few thousand small files (2-20KB) to copy between servers in one folder for backup purposes. Currently the process is automated as a cron job and does of SCP copy of each file to the remote ...
0
votes
1answer
127 views

Carve data in RAR archive that was incompletely downloaded

Is it possible to perform data carving the data (contents) of a .RAR archive, in its compressed form? I cannot uncompress/extract the .rar file because I could not completely download it. I downloaded ...
0
votes
5answers
3k views

Word 2007 file too big

I have this novel I'm formatting. It has 37 images, most of them greyscale. They are all under 100 kb each. Most of them are under 50 kb. So I already know it's NOT the images. It's. Not. The. Images. ...
0
votes
1answer
587 views

A good software to compress (archive) files to lesser size at possible [closed]

I'm looking for a software to compress (archive) files to lesser size at possible. I downloaded an zip file that was 10 MB but after exracting became 1 GB !!! The compression was wonderful. But I have ...
3
votes
1answer
1k views

Estimating compressed file size using a list parameter

I am currently compressing a list of files from a directory in the following format: tar -cvjf test_1.tar.gz -T test_1.lst --no-recursion The above command will compress only those files ...
0
votes
1answer
451 views

perform data carving on unallocated blocks/sectors of NTFS volume

I have used an app called blkls from The Sleuth Kit to extract (copy) (output) the unallocated blocks/sectors of an NTFS volume. By default, with no additional switches/options, blkls will copy/...
15
votes
5answers
10k views

Fastest GZIP utility

I'm looking for the fastest gzip (or zip) utility. I have a LVM volume which 95% exists out of blank 0's, so compressing that is very easy. I'm looking for the most fastest solution, and don't really ...
2
votes
1answer
87 views

low-pass filter for vector graphics [closed]

I have a SVG file which is too large. It contains a lot of fiddly details and I would happily eliminate some of these to simplify the whole file. With jpeg and other lossy compression formats, you ...
24
votes
5answers
8k 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 ...
0
votes
1answer
802 views

“Unexpected end of file” error while uncompressing lzma file

I've got a file called foo.tar.lzma. While trying to decompress it, I get "Unerwartetes Dateiende" ("Unexpected end of file"). I assume I lost quite a lot of bytes, but 1.1 GB are still there. The ...
0
votes
2answers
2k views

Free .ppt/.pptx compressor? [closed]

I recall back years ago having a good free PowerPoint compressor tool. It would shrink down file sizes, even convert .png embedded images to lesser file formats (i.e. gif at the cost of quality). ...
1
vote
3answers
5k views

BOOTMGR is compressed

So I've just finished messing up my computer beyond repair. I originally had a Windows 7 install on my 64GB SSD and all my data on my 1.5TB HDD. So I decided to install Windows 8 Consumer Preview. I ...
13
votes
1answer
13k views

How do I rar a file into several parts in Linux?

I want to make a rar file(not tar or gzip) with several parts in linux shell, how can do that please? for example my file is : m.avi - 500mb I want this : m.part1.rar 250mb m.part2.rar 250mb
2
votes
1answer
329 views

Why do OSX apps increase so much in size on 'installation'?

I downloaded VLC 2.0 for Mac. It was a 42 mb (0.008MB) download! The corresponding Windows installer is only 21 mb, despite the extra code for the installer itself. But even worse, when I open the ...
1
vote
2answers
380 views

Continually compressing a stderr stream

Is there some way to continually compress the output of a program (in almost realtime)? For example I have this program that produces (a lot of) output to stderr. I want to do something like ./my-...
6
votes
1answer
11k views

How to compress jpg images in Linux

I know that there is 'jpegoptim' to do so. But it not always downsize images as expected. For example if I execute jpegoptim --max=50 *.jpg on a 550KB image, the size will not really reduce. So I ...
1
vote
2answers
809 views

What do I do when my boot fails due to compression?

When I start up my computer I get BAXOS is compressed Press Ctrl+Alt+Del to restart. What is this error? Here are the necessary specifications of my machine: BIOS: American Megatrends ...
3
votes
6answers
3k views

Any method to batch-compress multiple files?

Does anyone know how multiple files can be GZIP compressed? I have lots of files in a folder and I need to compress them individually. Actually, I've found a way to do it. GZIP command line binary ...
1
vote
1answer
2k views

Is there a uncompressed format to PNG?

As we know PNG image format being the lossless format for image files. Compared to lossless audio file formats such as FLAC for example: When I decompress it, I get uncompressed .WAV file format. So ...
2
votes
2answers
226 views

Modern command line file compression utilities

I am frequently moving large files around from server to server. UNIXes comes with standard gzip and bzip2 compressors. However, what open options there exist beyond these, especially ones utilizing ...
1
vote
3answers
2k views

Is there better compression than RAR? [duplicate]

Possible Duplicate: Compressing with RAR vs ZIP As many will know, the RAR format produces consistently better results than ZIP. I've used RAR happily for many years and it's really occurred ...
1
vote
1answer
62 views

Extract files to a different folder

On a Windows XP machine, I have a zip file located on "c:\temp\mydata\okidata.zip". Using 7-Zip application, I would like to write a batch script and extract the file silently to the following ...
0
votes
1answer
318 views

How does the CentOS/Linux zip utility handle files that are changed during compression?

Question says it all: I have a directory that I want to 'zip -rv' up, but the files are changing all of the time (postgres database base backup). Will this break zip, or will it continue with a ...
11
votes
5answers
12k views

Mac OS X not reporting directory sizes correctly?

In Finder, I've noticed that if I duplicate some .app files (in the Applications folder), Finder will show that the duplicate .app file is not the same size as the original. This file size ...
6
votes
1answer
2k views

Compressing a file in place - does “gzip -c file | dd of=file” really work?

In the question How can I compress a file on Linux in-place, without using additional disk space?, one answer proposes to simply use gzip -c file | dd of=file I tried it (on Debian Linux), and it ...
1
vote
1answer
2k views

How should I compress my network traffic? How to make my connection 'faster'?

I have a slow ADSL currently, which could really benefit from some compression. I've also got servers in the country, with a very low ping (0, 1ms to the my ISP). Which software, 'solution' should ...
13
votes
4answers
8k views

How can I compress a file on Linux in-place, without using additional disk space?

I've got a 100GB drive that has a 95GB file. I need to free up some space on the drive (and right now transferring the file off the drive is not an option). The file would compress well with gzip or ...
1
vote
3answers
1k views

A compression (online) service?

Mysteriously, our connection is now very slow (10 KiB/s), so it takes a very long time to download large files (>= 900 MB). I'm searching for an online service that will: Download the original file ...
0
votes
1answer
481 views

Weird GZip / Disk space issue

I'm working on a server which is using PCI Compliant partitioning rules, which means that each of the following directories has its own partition: /, /var, /boot, /usr, /tmp and /home. The server is ...
2
votes
0answers
417 views

Does a smaller cluster size increase the ratio of NTFS compression?

I read that NTFS compression needs a partition formatted with an allocation unit size <= 4KB. Could a smaller cluster size of a partition give more compression and lessen wasted space? For example,...
2
votes
3answers
1k views

Create multiple zip files that are not dependent on each other?

I want to compress a folder into multiple zip files of 50MB each but don't want them to be dependent on each other. When I use Winzip and use the split feature it creates one zip file and the others ...
2
votes
1answer
2k views

Is it safe to compress my Windows 7 %USERPROFILE%\AppData folder?

Having just read Scott Hanselman's latest blog entry, Guide to Freeing up Disk Space under Windows 7, he suggests turning on NTFS compression which I already do for a number of less travelled folders ...
23
votes
2answers
43k views

What do the numbers 240 and 360 mean when downloading video? How can I tell which video is more compressed?

I have downloaded some computer science lectures from YouTube recently. There is usually more than one choice of file size and file format to download. I noticed that for the same video, the ...
8
votes
3answers
10k views

How do I convert tar.bz2 to tar.gz?

I'm new in Linux, is this conversion possible? Do I need to compress and decompress all content?
5
votes
3answers
3k views

Can compressing Program Files save space *and* give a significant boost to SSD performance?

Considering solid-state disk space is still an expensive resource, compressing large folders has appeal. Thanks to VirtualStore, could Program Files be a case where it might even improve performance? ...
2
votes
2answers
2k views

Why do bzip2 and gzip corrupt large heapdump files and can I work around it?

I'm trying to analyze heap dumps from a server which are fairly large files (10-15 GB). I create those files on the server and want to analyze them on my machine, so for downloading them, I tried ...
0
votes
1answer
143 views

Unzip delete and unzip

I am having an issue with commad line unzip and am not sure how to correct this. I am unzipping a compressed file and it processes it correctly. If the zip file should have some files removed and it ...
3
votes
3answers
1k views

If you switch NTFS compression on, why is the CPU load so low? Does it use SSE4.2 instructions behind the scenes?

I have a Hex-core Xeon X5650 running Windows 7 x64. I'm currently doing simultaneous compression of three NTFS hard drives, 2TB each, with the commands: compact e: /i /c /s compact f: /i /c /s ...
2
votes
3answers
559 views

How do I create a Windows XP compressed folder in Winzip?

When you create a compressed folder in Windows XP it appears to be a standard zip file but it's not. That said WinZip 9.0 (dated 2004) can read it. However the Windows XP compressed folder support ...
4
votes
2answers
14k views

Untar a given linux tarball on MAC OS X

I have a Linux tarball that can't be unpacked. It gives me an unexpected error. I am told this is due to case insensitive on MAC OS X. How can I untar this file? tar -zxvf file.tar.gz ... x output/...
0
votes
1answer
435 views

compression for large Maildir structure

I run a Debian Linux mailserver for a few little companies that stores its emails in a Maildir structure and therefore each mail as a seperate plain text file. Altogether these files are as large as ...
1
vote
0answers
100 views

IIS vs httpZip (or other product) Compression

We're currently comparing httpZip compression software. Has anyone used this and can offer a comparison between that product and IIS? Is there a big savings for httpZip over IIS? If you aren't ...
9
votes
2answers
13k views

How do I use 7-Zip for Windows to create .tar.gz archives?

How can I use the 7-Zip CLI (7za.exe) on Windows to create .tgz archives, as I use tar zcvf archive.tgz source_files on Linux?