Space Needed On Ssd For Osx Install Like A

On average, doubling the amount of memory in your system will give you ample space to work and will make an obvious difference in overall speed.

This is especially with todays memory-hungry applications such as office programs, multimedia editing packages, and graphics-intensive games.

More memory allows you to run more programs at once, and your favorite programs will be easier to use.

Space Needed On Ssd For Osx Install Like A

Give us a call, or install like a pro using our videos and guides.

It might also be possible to use Parted Magic from a bootable flash drive.

Cleared memory is not actually cleared; sensitive info may be available for the taking.

The Apple experts at Stack Exchange provide tips on staying safe.

Advertisement Im pretty new to SSD technology, so I dont know how it compares to hard drives when it comes to securely erasing the drive.

Is it enough to run Disk Utility and erase the drive with the option overwrite with zeroes, or does this only work with hard drives Are there other actions that should be taken Im not looking for NSA-grade security, but Id like to be safe if selling my Mac.

Total SSD Security Isnt Easy ( Answered by Gordon Davisson ) Unfortunately there isnt a simple answer, and it really depends on your paranoia level.

Because of the way SSDs handle writing data, doing a zero-once on an SSD is not as good a method of removing data as it is on a hard drive.

GO Media may get a commission Red Stretch Light Denim Pant Buy for 39 from JACHS NY When you write a particular data page on an HD, the new data is simply written over the old data, replacing it.

If you write zeros over the whole disk, all of the old data will be gone.

SSDs, on the other hand, cannot simply overwrite individual pages.

In order to replace the data on a page, the old data must first be erased, and SSDs cannot erase individual pages; they have to erase entire blocks consisting of many pages.

So what happens when you ask an SSD to overwrite, say, page 5, is that the SSD leaves the data on page 5 alone, but marks it as invalid, allocates another currently-blank page (say, 2305), writes the new data to page 2305, and makes a note that next time the OS asks for page 5 it should get 2305 instead.

The original page 5 data sits there until some later time, when the drive needs more space, moves any remaining valid pages away from the block, and erases it.

Advertisement The SSD Anthology: Understanding SSDs and New Drives from OCZ Read more The net result is that if you write zeros over the whole drive, you havent actually overwritten all the old data.

But if someones interested enough to bypass the controller, they could get some of your data back.

Advertisement Overwriting twice will probably work, but it depends on the controllers allocation strategy.

Overwriting twice with random data ( diskutil randomDisk 2 devdiskN ) is a little more likely to work, but still not guaranteed.

Note that recent versions of OS Xs graphical Disk Utility disable the secure erasure options on SSDs for the aforementioned reasons, but the command-line version still allows them.

I have also seen several recommendations to securely erase SSDs by converting them to an encrypted format, but this is (if anything) slightly less secure than overwriting with random data.

Advertisement The best way to securely erase an SSD is to invoke the controllers built-in secure-erase feature.

This shouldif the controller designers did their jobstruly erase all blocks, and also have the side-effect of resetting the logical page map, essentially defragmenting it and restoring its original performance.

Unfortunately, most of the utilities Ive seen for doing this (e.g.

CMRRs HDDErase ) run under DOS, which wont boot on a Mac.

Free Space Needed On Ssd For Osx