Likewise, it is almost impossible to securely delete an individual file on an SSD, because the way that SSDs write and delete files is scattered, and a user has no control over what an SSD is doing where. This can happen because of firmware bugs, and unless you're able to physically confirm that this procedure works on your SSD of choice, it's not reliable enough for a real secure erase. While the research paper noted above that overwriting did obscure all of the data in some of the SSDs they tested, some still had old readable data on them after twenty overwrites.
#HOW TO ENABLE FLASH ON MACBOOK AIR FULL#
This is called over-provisioning, and some deletion tools won't give you access to this area (if you can go through the BIOS and uninstall your drive, you can get full access). One is that many SSDs have extra storage space that's not accessible by users. The overwriting procedure that works so well for HDDs doesn't work as well for SSDs for a couple of reasons. Hard disk drives have had this problem solved for ages, and can execute a secure delete by filling the space occupied by an incriminating file with zeroes or multiple writes of different characters. Unconfirmed, but it looks like Apple is actively disabling the legacy erase techniques for SSD drives, since they don't work as noted in Ask Ars: How can I securely erase the data from my SSD drive?Īs pointed out in a recent research article, there isn't a standard method for securely deleting data from a solid state drive. It looks like securely erasing an SSD is a different chore than erasing a traditional hard drive. Let me know if that's works, this should securely erase the drive since it will then be encrypted.Īlso, in the future with Lion be sure to use FileVault 2 so that you don't have to worry about this again. Just erased the drive so all space is considered free. Space" and "Security Options" should do the same thing because you Select your level of security and off you go. "Security Options" buttons should no longer be grayed out.
#HOW TO ENABLE FLASH ON MACBOOK AIR FREE#
Now select the volume and the "Erase Free Space" and The encryption, it doesn't matter what it is because you won't need Erase the drive using "Mac OSĮxtended (Case-sensitive, Journaled, Encrypted). Restart the computer and hold option to enter the setup screen. Points out a work around to securely erase the SSD drive in the MacBook Air through encryption. Under the erase settings will be a security option when you can write the disk to 0 once or even multiple times. When it loads up, it will give you a few different options, you will need to use the Disk Utility part and highlight your HD and choose the Erase Tab. Once you have done either you can hold down the OPTION key while restarting your computer and booting from it. You can also make a USB Bootable Recovery Disk as explained here by Apple: If you have a USB Flash Drive of 8 GB of size, you can make a Lion Installer and use it to securely erase the Drive.
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