Now my dualboot is working again, just need to get audio to work.This article covers some of the common error messages and questions you might encounter while using Disk Utility. This article applies to the following versions of macOS: The following is not an exhaustive list of error messages, so you may not find your specific error here. Not sure what version you are using? Click here to determine your version of macOS. 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. If you are running macOS 10.13 (High Sierra) or later it is important to change the view in Disk Utility. Change the view to Show All Devices instead of the default which is Show Only Volumes. If you are running 10.12 or 10.11 this step is not required as the option is not available. You should see at least two, sometimes three, entries for your drive depending on how it is formatted. The non-indented entry is the physical disk which typically has Media in the name. The indented entries directly below are the volumes (partitions). This is important because when erasing the drive you will get different options depending on whether you have the volume or disk selected. What is that 134.2 MB volume on the drive? Which is why selecting the non-indented entry is important when formatting the drive. This volume exists because the drive is set up for Windows using GUID/ NTFS. It is shown as Microsoft Reserved in Disk Utility. This is typical and not an issue when using the drive as NTFS. For more technical information see Microsoft documentation - here. If you plan on using the drive for Mac only then you will want to erase the disk. If you will be going between Mac and Windows then there should be no issues. This was first seen in macOS 10.11 (El Capitan) and has continued. The button is greyed out because the drive is set up as MBR which is typically used for drives less than 3 TB. If you hover your mouse over the partition button you can see the tooltip provided by Apple. To resolve this, you must first erase the disk and set the Scheme to GUID Partition Map. If you are using it for Mac only then select a format specifically for macOS. For example Mac OS Extended (Journaled) or APFS. If you need to go between Mac and Windows then you would want to select ExFAT. If you are using this drive between macOS and Windows, back up any important data on the drive and reformat the drive ExFAT on macOS. Instructions for HFS+ formatting can be found here.Įrror Message - MediaKit reports not enough space If you are using this drive for macOS only, then reformat the drive Mac OS Extended (Journaled) also referred to as HFS+ for best compatibility. This error can occur when either erasing or partitioning the disk. It’s caused by Apple trying to use the 134.2 MB Microsoft Reserved volume for their EFI volume. Apple requires at least 200 MB for this volume which is why this error occurs. For more technical information see Apple documentation - here. There may be other ways to resolve this issue, but the easiest way is to erase the disk and set it up with a GUID scheme. This will allow Apple's Disk Utility to create its own volumes. Remember if GUID is not an available option then Show All Devices in the upper left is not selected as shown in the beginning of the article. If you are using this drive between macOS and Windows then back up any important data on the drive and reformat the drive ExFAT on macOS. Instructions for ExFAT formatting can be found here. This error can be caused for a few reasons.
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