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SSDs Harder to Securely Purge of Data than HDDs |
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SSDs Harder to Securely Purge of Data than HDDs Par Hack In The BoxLe [2011-02-21] à 02:40:54
Présentation : The ability to totally erase data from storage devices is a critical component of secure data management, regardless of whether the organization is just throwing away an old system or repurposing it for someone else's use. Recent research indicates, however, that sanitizing solid-state drives is not easy. Three researchers from the Department of Computer Science and Engineering and one from the Center for Magnetic Recording and Research at the University of California have empirically found that existing disk sanitization techniques don't work on SSDs because the internal architecture of an SSD is very different from a that of a hard disk drive, according to a paper presented Feb. 16 at the USENIX File and Storage Technologies Conference in San Jose, Calif. The researchers tested built-in ATA commands for erasing the entire SSD, existing software tools to erase the entire drive and software tools capable of securely erasing individual files. The researchers verified the reliability and effectiveness of the technique to determine what worked best. In the verification procedure, researchers wrote a structured data pattern to the drive, sanitized the drive using a known technique, dismantled the drive and extracted the raw data directly from the flash chips using a custom flash testing system.
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