In order to prevent your external hard drive from deleting data after power off, you can use a backup software or enable the "write protect" feature on your hard drive. This will ensure that your data remains safe even if the power is turned off.
It is possible to recover data that was deleted after power off, but it depends on the specific circumstances. If the data was overwritten or corrupted, it may not be possible to recover it. It is always recommended to regularly backup your data to avoid potential loss.
This could be due to a power saving feature or setting on your hard drive, which is designed to conserve energy by automatically deleting data after a certain period of inactivity. You can check the settings on your hard drive to adjust or disable this feature.
It is generally safe to leave your external hard drive connected to your computer when turning off the power. However, it is always recommended to properly eject the hard drive before disconnecting it to avoid any potential data loss or corruption.
You can check the user manual or instructions for your specific external hard drive model to see if it has a power saving feature that automatically deletes data. You can also check the settings on your hard drive or contact the manufacturer for more information.