The conv=noerror, sync switch ensures dd will not skip over any sectors and will be an exact copy. * Where /dev/sda is the drive you are acquiring the image of and capture.img is the chosen name and extension of the acquisition file. In a terminal window type: dd if=/dev/sda of=capture.img conv=noerror, sync These Linux Distributions are Forensics friendly: Take advantage of USB 3.0 speeds when possible. It is important to mention that your target drive needs to be of equal or greater size than the drive you are imaging. On a device where the hard drive is not easily accessible, if you can boot the device from a Linux Live ISO CD/USB, you can use the dd command to perform an acquisition. The problem with this is file meta-data can be altered when a drive is mounted, changing potential important evidence. The dd command captures all files, slack space, and unallocated data. Windows automatically mounts connected storage devices so a write-blocking hardware device must be used. The Data Dump( dd) command is available on all Linux distributions and is able to read and write to an unmounted drive because it is not bound by a logical file system. These flavors contain examiner tools, and are configured not to mount (or mount as read only) a connected storage media. There are a few Linux distributions designed specifically for digital forensics. Data Dump(dd) to Create a Forensic Image with Linux
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