How to securely erase the hard disk in Linux

How to securely erase the hard disk before selling ones computer

There are times when the news sites are abuzz with sensational news items. I am speaking of those news items which tempts one to pitch in and have his/her say come what may. And the news of someone who bought a laptop on ebay only to find it defective and how he took revenge on the seller by posting all the personal data on the hard disk on a website is by now a legend.

Now it is hard to decide who is in the right here – the person who published the private data on the website (for all you know, the laptop in question could have been damaged in transit) or the seller who is now the talk of the town, whose life is being dissected. There is no way to know. But that is besides the point. The truth is that it is scary to realize that it is next to impossible to delete all the data that one stores on ones storage media without completely destroying it. Because, with the right tools anybody can retrieve even deleted data.

So what can be done to alleviate the situation ? If you are using GNU/Linux or any other UNIX, then you have a tool called shred which can be used to wipe all the data from the hard disk. Here is how it works. Suppose I want to erase all the data on my hard disk, then I boot using a LiveCD like Knoppix and open a shell and type the following command:

# shred -vfz -n 100 /dev/hda

Here /dev/hda is my whole hard disk. And I am asking shred to make (-n) 100 passes by overwriting the entire hard disk with (-z) zeros. And shred program (-f) forces the write by changing the permissions wherever necessary.

Another GPLed tool (though not specifically related to Linux) which is quite popular is Darik’s Boot and Nuke (DBAN) which also does a swell job of wiping ones hard disk.

It is claimed that experts in the field of retrieving data can still get some data from a hard disk that has been wiped in the above manner. But atleast lesser mortals who buy second hand laptops and computers will find it beyond their means to lay their hands on the data.

All about Linux: How to securely erase the hard disk before selling ones computer

Windows 7 Features Demo

Demo of the upcoming Windows 7 with new features and applications.

Olympus E-520 announced, previewed

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At the end of the month Olympus will launch its E520 Four-Thirds followup to the E510. The 10 megapixel D-SLR features sensor-shifting image stabilization, the 2.7-inch LCD and AF Live View introduced on the E420, TruePic III image processing and Supersonic Wave Filter dust protection. Other features include Face Detection, Shadow Adjustment, and an optional Wireless flash control accessory when the body goes retail for about $600 Stateside. Digital Camera Resource Page already has a preview unit in house. So why not hit up the read link and take in their expert, early opinion of the latest Olympus E?

[Via 1001 Noisy Cameras]

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Official: HBO arrives on iTunes, standard pricing be damned

It’s official. HBO content just entered the digital halls of iTunes with variable pricing. Episodes of Rome and The Sopranos pop for $2.99 while The Wire and Sex and the City (yes the complete series) go for the iTunes “standard” pricing of $1.99. We just fired-up iTunes and confirmed it just like the rumor predicted. With Apple backing down from its strict, flat-rate pricing policy, don’t be surprised to see additional content from previously iTunes-shy providers arriving in succession.

Update: Deadwood ($2.99) and Flight of the Conchords ($1.99) are also available with “much more” apparently in the works.

[Thanks, Turki]

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Creative offers up USB-enabled Sound Blaster X-Fi Surround 5.1

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Creative is stretching that X-Fi family once more, this time with its external Sound Blaster X-Fi Surround 5.1. The USB-powered device is apparently geared towards laptops (well, ones without ExpressCard slots) itching for surround sound, and aside from the unicorn-like 24-bit Crystalizer and CMSS-3D technologies, you’ll find RCA outputs, an optical digital audio output, headphone out / microphone in jacks and all those X-Fi enhancements you’re sure to end up overlooking. It’s available now for the halfway respectable price of $59.99.

[Via CNET]

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