To use a flash drive as a boot disk (for example, with the OS for Raspberry Pi), it creates two partitions: the first one with the bootloader and occupies 60 MB, the second one with the OS files is a hidden partition and occupies the rest of the flash drive space. In my case it’s all about the type of previous formatting. This is not a problem with the flash drive at all. And it can happen with a flash drive from any manufacturer. If I try to format it using macOS built-in Disk Utility app, it will only free the space in that partition. I noticed that no matter the size of my SD memory card, after writing an image with OS for my Raspberry Pi, macOS can only recognize one partition with about 60 MB. In this article I will show you how to format a flash drive to reclaim full capacity and make it available for saving data again now. You may need to plug in the power adapter if there is not enough power to support the device that you plugged in to the hub.Have you ever met this problem that a flash memory card or USB flash drive is not showing the full capacity but a wrong size in macOS? I got this problem every time when trying to erase an SD memory card after working with Raspberry Pi. That last sentence in the installation directions on the box should be reworded to something like, “After the connection, plug in any USB device to the hub and the system will detect the hub. Once I plugged in the power adapter to the hub and plugged it into the wall/power strip/surge protector, everything worked just fine. Then I plugged in my flash drive into the hub (without the power adapter) and I got a message that there was not enough power and to plug in the power adapter if one accompanied the hub. So when no installation happened, I thought there was a problem.Īt first, I plugged in the hub with no power adapter and nothing happened (except the blue light on the hub). It says, “After the connection, the system will detect the hub and automatically complete the installation.” I was waiting for some software installation to occur. The last sentence in the installation description on the box is what threw me off. I thought the same phenomenon described above was happening to me when I plugged in the Plugable USB 2.0 10-Port Hub to my MacBook Pro, until I plugged in a USB device to the Hub and then plugged in the power adapter for the Hub.
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