Mac os x can only read usb drive

In the Utilities window, open the Disk Utility application.

External hard drive is detected as Read-only on Mac OS X – Kanguru Solutions Technical Support

Locate and select the Kanguru drive in the menu on the left side of the Disk Utility window. Select a Volume Format from the list of available formats.

Once the erase operation completes, go back to the drive info window and verify that the format has changed. To format your drive: 1.

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Solving read-only conditions for external hard drives

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.

The Disk Utility app does not see this hidden partition and therefore formats only the first partition instead of the two. To solve this issue, we will use the Terminal app and the tool diskutil. This tool is built-in in macOS, so we do not need to download or install anything.

What causes this issue

The instructions in the article below are designed to help format a flash drive. This process is data destructive and cannot be undone.

Once the process begins, all the data on the flash drive will be lost! Firstly, in order to avoid data loss, we need to restore and extract data from the flash drive. If we can open the flash drive, we may directly copy and save files from the flash drive to other storage device. If the flash drive is not accessible now, our best choice is to use any professional flash drive recovery software for help.

Launch the Terminal app from the Utilities folder of your Applications folder, or use Spotlight to find it. Now format the flash drive to FAT32 by running the following command this will erase the entire flash drive :. Do not forget to replace the disk2 before pressing the key Enter.

We reclaimed full capacity on flash drive, and make it available for saving data again now.

Access Mac HFS+ Partitions From Windows

We can leave our flash drive in the FAT32 format or convert it to any other format using the Disk Utility app. If this article helped you solve the problem then please leave a comment.