'is there something am I missing?' Does the WD drive have a 'hidden, proprietary partition', perhaps with some specialized WD software on it? Software intended for security, disk management, etc.? Sometimes 'pre-packaged' drives come this way out-of-the-box. Time required. Part 2: Partition USB drive macOS High Sierra. If your USB drive is formatted as GUID Partition Map, the Partition button should now no longer be greyed out. Select your drive in the sidebar (A) and click Partition (B). In the window that opens, use the + and - buttons in the lower left corner (C) to add and remove partitions. ![]() The presence of such a partition could prevent Disk Utility from properly re-initializing the drive. I personally have bought one USB flashdrive like this (Sandisk drive some years ago). It came with a proprietary partition that could not be removed on the Mac (at that time). I actually had to take it back to where I bought it (Circuit City, remember them?), and have a tech there remove the software using a Windows computer. After that was done, I then could re-initialize the drive to HFS+. Yes, I did, I also tried formatting using Terminal, to no avail, but as I explained the only way to do it was a 2007 mac mini. Could it be Hardware related? I'm running High Sierra 10.13.1 Beta (17B35a). Dynamics 365 for outlook mac. For Office for Mac, you can have up to 25 licenses associated with the same Microsoft account: only one license for an Office 365 subscription and multiple one-time-use installs of Office for Mac Home and Student or Home and Business. A one-time-use license can not be deactivated. If you don’t have an Office 365 subscription, start by using the license at the top of the list and moving your way down. If you have multiple Mac licenses associated with the same Microsoft account, it's best to start with an Office 365 subscription. Today to have peace of mind I tried an Intel 160GB ssd which I bought very cheap a few weeks ago and I had the same trouble as with the 8tb drive, went to the same friend and yes his old mini formatted the ssd first go, about one minute. I'm going to install an old os x version on the ssd, boot my iMac and see if it can format the drives normally. Yes, I did, I also tried formatting using Terminal, to no avail, but as I explained the only way to do it was a 2007 mac mini. Could it be Hardware related? I'm running High Sierra 10.13.1 Beta (17B35a). ![]() Today to have peace of mind I tried an Intel 160GB ssd which I bought very cheap a few weeks ago and I had the same trouble as with the 8tb drive, went to the same friend and yes his old mini formatted the ssd first go, about one minute. I'm going to install an old os x version on the ssd, boot my iMac and see if it can format the drives normally. I had many problems with Disk utility on High Sierra, formatting is one of them. I found out, that most drives I needed to format I can - eventually. Step 1 is generally eject the drive. Disk utility in HS seems to fail more than succeed in unmounting the drive on their own. Step 2 - once the drive is ejected, select the greyed out drive in Disk tools and partition or 'erase' as you want. Usually, on third or fourth attempt the formatting succeeds and drive is generally OK. Pcl color driver to use for mac os. Apple file systems are easier to create than others - few days ago I spent 15 minutes creating exFAT from HFS drive. Kind of nightmare, Sierra Disk utility were quite reliable, why did they have to screw up old functionality is not clear to me. I am also having an absolute nightmare with this all day. I bought a new WD 4TB external and tried several hours trying to get it to reformat. It fails every time. Now when I try to mount it, I get 'The disk you inserted was not readable by this computer.' Everything is grayed out in disk utility and I can't do anything. This is the 2nd hard drive I've tried to do this with after returning the first thinking something was wrong with the drive, but now clearly it is High Sierra. There's just no way to format external drives anymore. I don't own a windows computer either. How could Apple overlook this important issue? I had many problems with Disk utility on High Sierra, formatting is one of them. I found out, that most drives I needed to format I can - eventually.
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