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#46138 - 09/02/17 03:29 AM secure erase in HDDs and SSDs
jchuzi Online


Registered: 08/04/09
Loc: New York State
Although most of us know how to securely erase a HDD, the following article also shows how to do it on a SSD. How to Use Mac's Disk Utility to Securely Wipe a Drive
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Jon

OS 10.14.6, iMac Retina 5K 27-inch, late 2014, 3.5 GHz Intel Core i5, 1 TB fusion drive, 16 GB RAM, Epson SureColor P600, Photoshop CC, Lightroom CC, MS Office 365

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#46144 - 09/02/17 11:06 AM Re: secure erase in HDDs and SSDs [Re: jchuzi]
joemikeb Online
Moderator

Registered: 08/04/09
Loc: Fort Worth, Texas
I would add to OWC's comments on erasing an SSD, If the drive is formatted APFS each file's data is intentionally scattered all over the drive which makes any attempt to re-assemble the contents of any given file impractical if not impossible.
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#46147 - 09/02/17 01:08 PM Re: secure erase in HDDs and SSDs [Re: joemikeb]
artie505 Online


Registered: 08/04/09
Originally Posted By: joemikeb
...If the drive is formatted APFS each file's data is intentionally scattered all over the drive which makes any attempt to re-assemble the contents of any given file impractical if not impossible.

Isn't that the case with an SSD formatted HFS+, too?
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In Memory Of Harv: Those who can make you believe absurdities can make you commit atrocities. ~Voltaire

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#46169 - 09/04/17 08:47 AM Re: secure erase in HDDs and SSDs [Re: artie505]
joemikeb Online
Moderator

Registered: 08/04/09
Loc: Fort Worth, Texas
Originally Posted By: artie505
Originally Posted By: joemikeb
...If the drive is formatted APFS each file's data is intentionally scattered all over the drive which makes any attempt to re-assemble the contents of any given file impractical if not impossible.

Isn't that the case with an SSD formatted HFS+, too?

Yes, but as I understand it, not to the same extent as in APFS. For one thing there is an additional virtualization layer in APFS. For example you can have multiple APFS volumes on a drive and theoretically each would have the maximum capacity of the drive available to it. Roughly analogous to having multiple sparse disk image or sparse image bundles on an HFS+ volume.
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#46176 - 09/04/17 04:08 PM Re: secure erase in HDDs and SSDs [Re: joemikeb]
artie505 Online


Registered: 08/04/09
As its pieces fall into place, APFS gets more and more interesting...if not fascinating.

Thanks. smile
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The new Great Equalizer is the SEND button.

In Memory Of Harv: Those who can make you believe absurdities can make you commit atrocities. ~Voltaire

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