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Apple Computing Products:
macOS - Operating System
After failed Big Sur upgrade and manual High Sierra installation, I have two disks : "Update" and "iMac_SSD - Data". How do I fix this?
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<blockquote data-quote="jaxx67367346" data-source="post: 1909894" data-attributes="member: 411962"><p>Hi guys,</p><p></p><p>I am coming to you to ask for your help.</p><p></p><p>I own an iMac (Retina 4k, 21.5-inch, late 2015</p><p>Processor 3.1 GHz Intel Core i5</p><p>Memory 8 GB 1867 MHz DDR3</p><p>Graphics Intel Iris Pro Graphics 6200 1536 MB)</p><p></p><p>It must be said that 4 years ago, I brought my iMac in a specialised store, where they changed the main drive (which was slow and sometimes unresponsive), to an SSD drive.</p><p></p><p>Because I am stupid, I’m unable to remember exactly which OS I was running before the problem happened.</p><p></p><p>Anyhow, basically, at some point, in a rush leaving for work and trying to turn off my computer, I accepted some update: upgrade to Big Sur.</p><p></p><p>After that, I was unable to restart my computer: it gets stuck at the loading screen (I tried leaving my iMac on for 48 hours, just to make sure it wasn’t the installation that was taking some time). I tried recovery mode (first aid on both the drive, which I think were iMac_SSD and iMac_SSD - Data ; reinstalling big sur) but to no avail.</p><p></p><p>I created a bootable installer with macOS Catalina. Unfortunately, I was unable to install Catalina (the iMac_SSD wouldn’t appear in the disk I could install Catalina on). I read somewhere that it was because I needed an APFS-compatible OS.</p><p></p><p>I created a new bootable installer with macOS High Sierra. Which - sort of - worked. I got asked if I wanted to install High Sierra on the disk “Update” or the disk “iMac_SSD - data”. </p><p></p><p>I chose the "Update"-disk and it installed High Sierra. Now, I see in the finder “iMac - SSD - Data”. I managed to save most of my data from “the iMac_SSD - Data” drive, on an external drive.</p><p></p><p>Now I am wondering what to do. How do I reset everything and do a fresh install? I feel like the Big Sur upgrade split my disk in two, with this weird “Update” disk, and the other “iMac_SSD - Data”.</p><p></p><p>If I go in the Disk Utiliy, I see two internal disks: </p><p></p><p>"Update" (1.05 TB ; "shared by 5 volumes"), which has 11.85 GB used, 703.36 GB other volumes, 337.45 GB Free. <a href="https://i.imgur.com/wGAQDPk.png" target="_blank"><strong>Screenshot 1</strong></a><strong> ; </strong><a href="https://i.imgur.com/r1A4j1W.png" target="_blank"><strong>Screenshot 2</strong></a></p><p></p><p>"iMac_SSD - Data" (1.05 TB ; "shared by 5 volumes"), which has 681.57 GB used, 33.63 GB other volumes, 337.45 GB Free. <a href="https://i.imgur.com/lKc9XNc.png" target="_blank"><strong>Screenshot 1</strong></a><strong> ; </strong><a href="https://i.imgur.com/w2aHhr9.png" target="_blank"><strong>Screenshot 2</strong></a></p><p></p><p>Is there anyway to fix everything while keeping my data? If yes, how?</p><p></p><p>If not, how do I reset everything ?</p><p></p><p>Many thanks if you can help me, this would be greatly appreciated! <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big grin :D" loading="lazy" data-shortname=":D" /></p></blockquote><p></p>
[QUOTE="jaxx67367346, post: 1909894, member: 411962"] Hi guys, I am coming to you to ask for your help. I own an iMac (Retina 4k, 21.5-inch, late 2015 Processor 3.1 GHz Intel Core i5 Memory 8 GB 1867 MHz DDR3 Graphics Intel Iris Pro Graphics 6200 1536 MB) It must be said that 4 years ago, I brought my iMac in a specialised store, where they changed the main drive (which was slow and sometimes unresponsive), to an SSD drive. Because I am stupid, I’m unable to remember exactly which OS I was running before the problem happened. Anyhow, basically, at some point, in a rush leaving for work and trying to turn off my computer, I accepted some update: upgrade to Big Sur. After that, I was unable to restart my computer: it gets stuck at the loading screen (I tried leaving my iMac on for 48 hours, just to make sure it wasn’t the installation that was taking some time). I tried recovery mode (first aid on both the drive, which I think were iMac_SSD and iMac_SSD - Data ; reinstalling big sur) but to no avail. I created a bootable installer with macOS Catalina. Unfortunately, I was unable to install Catalina (the iMac_SSD wouldn’t appear in the disk I could install Catalina on). I read somewhere that it was because I needed an APFS-compatible OS. I created a new bootable installer with macOS High Sierra. Which - sort of - worked. I got asked if I wanted to install High Sierra on the disk “Update” or the disk “iMac_SSD - data”. I chose the "Update"-disk and it installed High Sierra. Now, I see in the finder “iMac - SSD - Data”. I managed to save most of my data from “the iMac_SSD - Data” drive, on an external drive. Now I am wondering what to do. How do I reset everything and do a fresh install? I feel like the Big Sur upgrade split my disk in two, with this weird “Update” disk, and the other “iMac_SSD - Data”. If I go in the Disk Utiliy, I see two internal disks: "Update" (1.05 TB ; "shared by 5 volumes"), which has 11.85 GB used, 703.36 GB other volumes, 337.45 GB Free. [URL='https://i.imgur.com/wGAQDPk.png'][B]Screenshot 1[/B][/URL][B] ; [/B][URL='https://i.imgur.com/r1A4j1W.png'][B]Screenshot 2[/B][/URL] "iMac_SSD - Data" (1.05 TB ; "shared by 5 volumes"), which has 681.57 GB used, 33.63 GB other volumes, 337.45 GB Free. [URL='https://i.imgur.com/lKc9XNc.png'][B]Screenshot 1[/B][/URL][B] ; [/B][URL='https://i.imgur.com/w2aHhr9.png'][B]Screenshot 2[/B][/URL] Is there anyway to fix everything while keeping my data? If yes, how? If not, how do I reset everything ? Many thanks if you can help me, this would be greatly appreciated! :D [/QUOTE]
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Apple Computing Products:
macOS - Operating System
After failed Big Sur upgrade and manual High Sierra installation, I have two disks : "Update" and "iMac_SSD - Data". How do I fix this?
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