uncleflo
Registered since September 28th, 2017
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Tag selected: dd.
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Make ISO Images on Linux | kvz.io
Saved by uncleflo on March 11th, 2016.
CDs and DVDs don't have the eternal life, so you might want to back them up as ISO images. All the files and properties of the original disc, stored in a single file. You can also create ISO images and store them on your network for easy distribution of software installations. Here's how to create and mount ISO images on Linux.
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filesystems - recovering ext4 partition after dd'ing over start of HD - Unix & Linux Stack Exchange
Saved by uncleflo on August 9th, 2014.
I accidentally used dd and wrote over the first 208MB of my external disk. What I wrote over is a partition on its own (Debian nestinstaller) so what I see now is not my old (now damaged) ext4 partition but another smaller partition. This limits the tools and advices I could follow. My plan was to recreate the partition table with testdisk and then fix everything with the backup superblocks as described here. I'd lose the first 208MB but that's ok compared to the other 300GB of data in there. Something like the following:
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major.io - Mounting a raw partition file made with dd or dd_rescue in Linux
Saved by uncleflo on August 9th, 2014.
This situation might not affect everyone, but it struck me today and left me scratching my head. Consider a situation where you need to clone one drive to another with dd or when a hard drive is failing badly and you use dd_rescue to salvage whatever data you can.
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filesystem - How do you monitor the progress of dd? - Ask Ubuntu
Saved by uncleflo on August 23rd, 2013.
dd is a wonder allowing you to duplicate a hard drive to another, completely zero a hard drive, etc. But once you launch a dd command, there's nothing to tell you of it's progress. It just sits there at the cursor until the command finally finishes. So how does one monitor dd's progress?
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dd - writing zeros - general question
Saved by uncleflo on August 23rd, 2013.
Can't figure out why using dd to write zeros to a hard drive is so slow. Yesterday, I prepped a hard drive for a friend and did the standard command: dd if=/dev/zero of=/dev/sda The machine I used has a Core 2 Duo 2.4 Ghz cpu, 2 Gigs of DDR2 800 RAM, a new Intel mobo, and a Western Digital 250 gig. SATA drive with 16 meg. cache. The result was 30,482 seconds (approx. 8.5 hrs.) to write zeros to the entire 500 Gig. drive, at an average rate of 16.4 MB/sec.
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Linux Commando: Create File of a Given Size ... with random contents
Saved by uncleflo on November 23rd, 2012.
A while back, I wrote about how to create a zero-filled file of any arbitrary size. This is part 2 where I share how to create a file of random contents (not just zeroes). Recently, I ran into a situation where a zero-filled file is insufficient. I needed to create a log file of size 2 MB in order to be zipped up and copied to another server.
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dd (Unix) - Wikipedia, the free encyclopedia
Saved by uncleflo on January 13th, 2011.
dd is a common Unix program whose primary purpose is the low-level copying and conversion of raw data. dd is an application that will "convert and copy a file" [1] according to the referenced manual page for Version 7 Unix and is most likely inspired from DD found in IBM JCL, and the command's syntax is meant to be reminiscent of this;[2] in JCL, "DD" stands for Data Description. dd is used to copy a specified number of bytes or blocks, performing on-the-fly byte order conversions, as well as more esoteric EBCDIC to ASCII conversions.[3] dd can also be used to copy regions of raw device files, e.g. backing up the boot sector of a hard disk, or to read fixed amounts of data from special files like /dev/zero or /dev/random.[4]
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