Finding The Disk Identifierīefore you can proceed, you must find out the disk number or identifier. Firing up disk Utility, right-clicking the drive and selecting Erase. Most USB drives, even those with only 2 TB of storage or less nowadays with a GPT but the 4 TB LaCie Samsung drives still used a Master Boot Record (MBR). They show the partition type, either GUID_partion_scheme, APFS Container Scheme, or MBR_partition_scheme. You can see similar information from the command-line: $ diskutil listĢ: Apple_APFS Container disk1 500.0 GB disk0s2 Before that it showed 374 MB capacity, and Master Boot Record (MBR) for the partition map type. ![]() The drive displayed above is already converted. Selecting one in the upper-right pane shows the relevant information: You can now see the different USB drives attached. and select USB from the Hardware section. ![]() Select About This Mac from the Apple menu in the top-left corner, click on System Report. ![]() It turned out that I first had to create a GUID Partition Table (GPT) on it to use the full capacity. My new LaCie rugged USB-C drive showed only a capacity of 372 MB instead of the 4 TB that I had bought, when I formatted the disk on Mac OS X High Sierra.
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