Thanks for the quick reply. I will read the article that you linked. Although "user error" is always my first guess, it seems unlikely that twice in a row I mistakenly clicked on a button other than the one I intended, especially after messing up once. And if I clicked on the button I intended, then I'm still confused because I'm sure I have done this many times before without a problem, though I suppose something in the OS could have changed recently.
Thanks again for responding. Maybe the article you cited will provide the answer, though I have not had time to read it yet. I really appreciate your willingness to help. Gregg On Nov 2, 2014, at 4:12 PM, Macs R We <[email protected]> wrote: > From the symptoms, it sounds to me like you accidentally did something that > started the RAID (or other logical volume) process on that device. Now it’s > waiting to be combined with other devices to make up a logical volume. > > You may have to break out Terminal and dick with the “diskutil coreStorage” > suite in order to tell the system you want to revert it to an independent > volume. As long as you don’t accidentally target the wrong drive with any of > the commands, it’s not dangerous. I had to do this myself to roll my own > Fusion drive… and then unroll it again when the experiment failed miserably > ("Could not mount disk16 with name (null) after erase,” whatever the **** > that means). > > This article may give you a basic power-user's understanding of how Logical > Volume Groups are structured, at least enough for you to do the task ahead of > you. > > On Nov 2, 2014, at 1:52 PM, Dinse, Gregg (NIH/NIEHS) [C] > <[email protected]> wrote: > >> Hi, >> >> When I want to re-use a hard drive for a new purpose, I open Disk Utility >> and click the Partition tab. Then I choose how many partitions I want, >> their sizes, and their names. I don't know how I got into the habit of >> doing this next step, but next I click on the Erase tab and give the same >> disk name. Today I did this and had problems, even though it has always >> worked fine in the past. I am running 10.9.5 and the disks are inside a >> 2012 Mac Pro. >> >> Typically in Disk Utility, each disk has a primary entry on the left of the >> main window, which gives the total size of the disk, the brand, and the >> model, such as "3 TB Seagate ST33000651AS". And then each partition has its >> own line, which shows the name of the partition. And lots of useful >> information is given at the bottom of the window. >> >> Earlier today, I re-created a single partition on a 3-TB drive and gave it >> the name "Disk_1". Then I erased the disk and gave it the same name >> (Disk_1). This is when the trouble started. At this point, both the main >> line and the indented line showed the same name (Disk_1), rather than the >> primary line showing something like "3 TB Seagate ST33000651AS". >> >> Also, when the primary line is selected, the bottom of the window shows 0 >> Bytes available and 3 TB used, even though that is not the case. If I click >> on the indented line, it says 2.99 TB available and 10 GB used, which sounds >> right. Also, when I click on the primary line, the Type is listed as >> Logical Volume Group rather than something like SATA Internal. >> >> I have tried to repair the disk, but this does not help. I don't see any >> errors, though the listing is longer than usual. When I select the primary >> line, I only get 2 tabs (First Aid and Partition) rather than the usual 5 >> tabs (First Aid, Erase, Partition, RAID, Restore). And if I click on >> Partition, everything is greyed out -- I can't choose a new partition >> layout, or name, or size, nor can I click on the Options button or the >> Revert button. >> >> I do not think the disk itself is bad (or at least not before I started >> mucking with it), so I tried a second disk and had even worse results. I >> wondered if the name "Disk_1" was a bad choice, since perhaps it is reserved >> for use by the system (though if so, I would hope the system would warn me >> not to use that name). So I called this one HD_2. This time, when things >> looked to be going bad in the same way, I clicked on a Cancel button, hoping >> to prevent the same problem. But this must have made a worse mess. Now I >> only have a main entry, and again it says "HD_2" rather than something like >> "3 TB Seagate ST33000651AS". Also, it again says "Logical Volume Group" >> rather than SATA Internal. And there is no second, indented line! As >> before, there are only 2 tabs rather than 5. And if I click on the >> Partition tab, everything is greyed out, so I can't do anything. >> >> What have I done? Is there some way to fix my disks? I tried copying a >> large file to Disk_1 and it seemed to work. But something sure seems messed >> up. And I don't know how to rename or repartition these disks. I sure >> don't trust them in their current state. >> >> By the way, somewhere in this process I remember seeing a message about an >> encrypted disk, but I did not intentially do anything with encryption (now >> or ever). I don't know if that is related. >> >> Any help would be very much appreciated! Thanks in advance, >> >> Gregg _______________________________________________ MacOSX-talk mailing list [email protected] http://www.omnigroup.com/mailman/listinfo/macosx-talk
