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Commercial proprietary software: OS X: Yes external [6]? Eraser: Heidi Computers Limited GNU GPL v3: Windows: Yes external [7]? HDDerase: University of California, San Diego: Freeware: OS independent, based on DOS: No internal [8]? hdparm: Mark Lord BSD license: Linux: Yes internal [9] not directly supported without scripting nwipe: Martijn van ...
Data erasure (sometimes referred to as data clearing, data wiping, or data destruction) is a software-based method of data sanitization that aims to completely destroy all electronic data residing on a hard disk drive or other digital media by overwriting data onto all sectors of the device in an irreversible process. By overwriting the data on ...
A block, a contiguous number of bytes, is the minimum unit of storage that is read from and written to a disk by a disk driver.The earliest disk drives had fixed block sizes (e.g. the IBM 350 disk storage unit (of the late 1950s) block size was 100 six-bit characters) but starting with the 1301 [8] IBM marketed subsystems that featured variable block sizes: a particular track could have blocks ...
Opal Storage Specification specifies a command set for self-encrypting drives and cryptographic erase, available in addition to command-set methods. The drive usually performs fast cryptographic erasure when data is encrypted, and a slower data erasure by overwriting otherwise. [18] SCSI allows for asking for a specific type of erasure. [17]
Data remanence is the residual representation of digital data that remains even after attempts have been made to remove or erase the data. This residue may result from data being left intact by a nominal file deletion operation, by reformatting of storage media that does not remove data previously written to the media, or through physical properties of the storage media that allow previously ...
It supports a variety of data destruction standards, including British HMG IS5 (Infosec Standard 5), American DoD 5220.22-M, and the Gutmann method which features a 35-pass overwrite. [ 7 ] The tool has been recommended in TechAdvisor , [ 8 ] The Guardian , [ 3 ] and PC World , [ 9 ] and is a tool suggested by the United States government ...
For a very brief time, the data could still reside on the flash internally. However, after the TRIM command is issued and garbage collection has taken place, data recovery can become difficult or impossible, depending on the drive's firmware implementation of the command.
The basic concept behind flash file systems is: when the flash store is to be updated, the file system will write a new copy of the changed data over to a fresh block, remap the file pointers, then erase the old block later when it has time. In practice, flash file systems are used only for Memory Technology Devices (MTDs), which are embedded ...