![]() ![]() Apple requires at least 200 MB for this volume which is why this error occurs. It’s caused by Apple trying to use the 134.2 MB Microsoft Reserved volume for their EFI volume. This error can occur when either erasing or partitioning the disk. 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. Instructions for ExFAT formatting can be found here. 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. If you need to go between Mac and Windows then you would want to select ExFAT. For example Mac OS Extended (Journaled) or APFS. If you are using it for Mac only then select a format specifically for macOS. To resolve this, you must first erase the disk and set the Scheme to GUID Partition Map. If you hover your mouse over the partition button you can see the tooltip provided by Apple. The button is greyed out because the drive is set up as MBR which is typically used for drives less than 3 TB. This was first seen in macOS 10.11 (El Capitan) and has continued. ![]() If you will be going between Mac and Windows then there should be no issues. If you plan on using the drive for Mac only then you will want to erase the disk. ![]() For more technical information see Microsoft documentation - here. This is typical and not an issue when using the drive as NTFS. ![]() It is shown as Microsoft Reserved in Disk Utility. This volume exists because the drive is set up for Windows using GUID/ NTFS. 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 is important because when erasing the drive you will get different options depending on whether you have the volume or disk selected. The indented entries directly below are the volumes (partitions). The non-indented entry is the physical disk which typically has Media in the name. You should see at least two, sometimes three, entries for your drive depending on how it is formatted. If you are running 10.12 or 10.11 this step is not required as the option is not available. Change the view to Show All Devices instead of the default which is Show Only Volumes. If you are running macOS 10.13 (High Sierra) or later it is important to change the view in Disk Utility. 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. Not sure what version you are using? Click here to determine your version of macOS. 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. dev/disk2s1).This article covers some of the common error messages and questions you might encounter while using Disk Utility. We need to specify the location of the partition with its full path (i.e. On my system I have two internal hard disks (disk0 and disk1), and one external USB drive (disk2). It is those partitions we’ll mount and unmount, NOT the physical drive. Make a mental note of the latter: you’ll see that we have a physical disk (like disk0), on which several partitions may have been created. dev/disk0, /dev/disk1, etc), as well as with their respective partitions if available on the right (like disk0s1, disk1s2, etc). You’ll see output like this:Ģ: Apple_HFS Macintosh SSD 511.3 GB disk0s2ģ: Apple_Boot Recovery HD 650.0 MB disk0s3Ģ: Apple_HFS Mac HDD 1TB 999.9 GB disk1s2Īttached drives are listed with their physical locations on the left (i.e. To see what’s currently attached to your Mac, let’s use the diskutil command, followed by the word list. Fire up a Terminal session and see how to do it. However, there is a way to do this via the command line, of which I am a big fan. Mounting usually happens automatically when a new drive is inserted into a USB port or SD card slot. Unmounting external drives on a Mac is usually done quick and simple by either dragging drive icon to the trash, or by using the eject symbol in a Finder window. ![]()
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