Hold down one of these combinations immediately after pressing the power button to turn on your Mac.
Getting the software
Release when you see the Apple logo or a spinning globe. Command-R Reinstall the latest macOS that was installed on your Mac, without upgrading to a later version. If you haven't already installed macOS Sierra Erase your startup disk Erasing your startup disk permanently deletes all of the data stored on it. Select your startup disk in the sidebar of Disk Utility. Select the disk name, not the volume name indented beneath it. Click the Erase button or tab. If you don't see an erase button or tab, select the volume name indented beneath the disk name, then look again.
Complete these fields: Enter a name for your disk, such as "Macintosh HD". When done, quit Disk Utility to return to the utilities window. You're now ready to reinstall macOS. Open Migration Assistant, which is in the Utilities folder of your Applications folder.
hard drive - How to upgrade firmware and reperform a Samsung Evo on a Mac - Ask Different
Click Continue. When asked how you want to transfer your information, select the option to transfer from a Mac, Time Machine backup, or startup disk. I want to say thank you for giving me a detailed answer to my problem. Thanks again. Glad you're there. Page content loaded. May 23, 2: May 23, Enabling TRIM is a good idea though it would be wise to ensure your firmware is up-to-date first.
Note that TRIM involves reporting the freeing up of drive space due to file deletion to the SSD controller when the deletion takes place; since it's not retroactive, it can't look back in time to report previous deletions to aid in Garbage Collection. May 23, 5: This results in a reduction of the number of erase cycles on the flash memory and enables higher performance during writes. May 23, 6: May 24, If this should ever change, the bug in Samsung's firmware could give data loss.
After a reboot, my computer got a "Forbidden" symbol on screen, nothing else. Rebooted while holding Option Alt and selected Recovery Which was called After reinstalling OS X not wiping the drive! I was back on the desktop, and still on I did re-download that update and run it to be absolutely sure all system files were the most recent version. From here I wrote "fsck -fy" and let it run, then did it another time.
To use the bootable media, insert it and then restart the Mac while holding down the Option key. This displays the list of connected bootable volumes. From this point on, the Samsung Performance Restoration utility takes over and works pretty much as it says in the Installation Guide. The tool first installs a firmware update on the drive itself.
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When the firmware update is done, the software goes through a two-step process which includes recalibrating all the data on the drive. This can take a while and it depends on how big your SSD is. Do not interrupt the process. At this point you can just hold down the Power button on your Mac until it turns off, there appears to be no way to do a soft reboot from this point.
Maximize your SSD's potential with Magician software
If you want to eject the optical disc, hold down the mouse or trackpad button during restart and the Mac will pop out the disc before it even gets to the desktop. I cannot get my own machine, Mac Pro 3,1 [Early ] to work by any of the above methods. Next will be to just back it up, drop it in a PC, do it there. I don't think the necessary driver for the thunderbolt interface is included in the isolinux provided, at least i couldn't find any traces in the iso.
Additionally Samsung advices to backup all your data on the SSD before updating the firmware or executing the performance restoration software. Please first check Samsung Performance Restoration Manual before updating the firmware and particularly General Limitations: If you have bootcamp installed, i would recommend running the Magician tool provided by Samsung there.
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