Seagate make two external USB drives. The Seagate Backup Plus and the Seagate Expansion. They are both USB 3 compatible. However, the steps are suitable for Mac OS X 10.6.8 to 10.10.5. For instructions on how to format a drive in Mac OS 10.11 (El Capitan) and above click here. To reformat the drive in Mac OS X: 1. Open Disk Utility Applications>Utilities>Disk Utilities 2. Select the Seagate drive on the left that shows the capacity 3. How to format your drive in macOS 10.11 and above. Note: Reformatting the drive will erase all data on the drive, so you should copy any data you want off the drive prior to formatting. The following is based on the latest version of macOS. Open Disk Utility Open Finder > Applications > Utilities > Disk Utility. Select the Seagate drive. They both come with a three-year warranty in Australia, although in the USA the expansion only has a 1 year warranty. The Backup Plus model costs $20 more. A lot of reviewers say that the backup plus is more reliable (e.g. But is there any difference? I pulled them apart to see! What I bought. I went down to our local Officeworks store and bought a 2TB Seagate backup plus for $129 and a 2TB Seagate expansion for $109. I opened them up to see what was different, and did some tests. Here is what I found What’s inside? It turns out the hard drives are exactly the same! On the left is the drive out of the Seagate Backup Plus, it is labelled ‘Desktop HDD’. On the right is the drive out of the Seagate expansion. It is labelled ‘Barracuda’. But take a look at the model number ( you may need to click on the picture to enlarge it). They both have exactly the same model number – ST2000DM001. This is Seagate’s low-cost desktop hard drive. So the Seagate backup plus and the Seagate expansion have exactly the same hard disk drive inside them. In terms of hard disk reliability, seek times and so forth it makes no difference whether you get the backup plus or the expansion. For this reason, if you are just connecting them to your Apple Macintosh computer to use as an external hard drive for some extra room, or to backup, it doesn’t make a difference what model you purchase. The names are misleading You can use the ‘Backup Plus’ for expansion. You can use the ‘Expansion’ for backup. So are there any differences? These are instructions on how to format a hard drive using Mac OS X Disk Utility. Step One If your hard drive is an external drive, connect it to the computer. Launch Disk Utility from the Applications:Utilities folder. Step Two From the list on the left select the drive you would like to format Step Three Click to select the Erase tab. Step Four From the Volume Format dropdown select the format you would like the drive to be in. Step Five Enter the title for your volume in the Name field. Step Six Press the Security Options. Button to specify how to erase the drive. You can choose: Don't Erase Data, Zero Out Data, 7-Pass Erase, or 35-Pass Erase. Click the OK button to continue. Step Seven You are now ready to begin the format. Click the Erase. Button to start. Step Eight From the popup that appears click the Erase button to confirm you would like to format. Step Nine You will notice a status bar appear with the progress of your format. Step Ten Once the format has completed you will notice the disk remount in Disk Utility! Mac or pc for photography.
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