You just need to indicate the partition name in input file as below. Or you can create a partition image as below. Save a disk or a partition helps to restore all the data, if there is any problem with our original drive.
To restore, you need to inverse the input file with the output file indicated during backup operation as below. You need to first indicate the compressed file and the output file which is the disk compressed before.
The -d option here is to uncompress. Note the output file. You can mount the restored disk to see the content. Note that you will data added after the last compression backup operation. You can need to create a virtual filesystem on Linux for some reasons as creating a virtual machine on your Linux host.
A virtual filesystem is a filesystem that exists in a file, which in turn exists on a physical disk. You can need it to create for example an additional swap or loop device or a virtual machine.
In other words, this will create a data file with all zeros in the file which will give the size to a file. The option count refers to the number of input blocks to be copied. Combined with block size value, it indicates the total size to copy. You can see that we have our virtual filesystem created with the size indicated.
You can now use it to create loop device or a virtual disk or anything else. If during the operation you indicate an existing output file, you will lose its data. For some reasons, you can need to replace a block size of the output file. The notrunc option refers to do not truncate the file, only replace the first bytes, if it exists.
Otherwise, you will get a byte file. You may wonder why not just copy the contents of your CD to a directory. How would you handle the boot sector of a CD? Because dd copies sector by sector, on the other hand, it will copy that information as well.
You need to know that you have to use the -o loop option, which allows you to mount a file like any normal device. The MBR makes up the first bytes of the disk, allowing up to bytes of storage for the bootloader.
Excellent, this saved me having to put a script together myself. I have been backing up huge vmdk files to Rackspace CloudFiles, and they have a 5GB per object limit. Cheers for the tip. This came up on a search and was useful for recovering some simulations that I had accidentally appended to, rather than overwritten. I also had problems with the printf of the FILE name putting quotes in the filenames at the beginning and end of every part….
In case of premature errors where all the pieces are not generated, perhaps we could provide an option that identifies that some of the parts are there already, and if we would like to regenerate them all or just the missing parts. If you wanted to do GB on your first one and 40 on your second, you might do:. Comming late for the party, but I had to do such a script to backup an unknown file system on a FAT32 stick. EDIT: Have uploaded a basic backup restore script that uses dd, pigz or gzip compression and splits files into chunks that can be set at commandline.
Script found here: github. Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group.
Create a free Team What is Teams? Learn more. Break up a dd image into multiple files Ask Question. Asked 12 years, 1 month ago. Active 3 years ago. Viewed 17k times. I have three HDs, with , 40, and GB free. Improve this question. You don't want to use 'G' for count. Count is the number of 'bs' sized blocks you want to use. Add a comment. Active Oldest Votes. Improve this answer. Yeah, you do not want to use GB in the manner the original poster listed.
A better way is to set your blocksize to a larger and more reasonable number unless you have a good reason for going smaller, I'd always go at least 1MB. Aaron Aaron 1 1 silver badge 4 4 bronze badges. A concrete extension to serverfault.
Michael Tiller Michael Tiller 2 2 bronze badges. Can't believe this only had 1 vote! It has the ability to break up files into multiple volumes.
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