My Mac is running very slow and i have noticed that the the internal drive is full

Hi Joannaeliades

welcome to the Apple (user-to user) Community!

Re: "mac is running very slow and i have noticed that the the internal drive is full

You might want to check whether your Mac has very little memory / storage space free in which to operate smoothly. Eg: A Mac generally needs around 50Gb free in which to do everything you ask it to do.

Click the Black Apple icon in your Mac's top Menu bar > About this Mac > Storage

More info: See used and available storage space on your Mac - Apple Support

Re: "This internal drive ‘APPLE HDD HTS541010A9E662 Media’is full - what does that mean!"

Haven't experienced that myself, so I do not know for sure. (Media generally means photos, videos, music, etc.)

If you find your Mac does needs more free / available space : It is wise to first back up everything on your Mac:

That way, you can recover anything you find you need after deleting items to make space available.

If needed: Back up your files with Time Machine on Mac - Apple Support

or

How to: Connect and use other storage devices with Mac - Apple Support

To clear more storage space on your Mac, you may want to follow the guidance in the article below:

Eg: says: "Choose Apple menu > About This Mac, click Storage, then click Manage"

See: How to: Optimize storage space on your Mac - Apple Support

NB: Be sure to empty the Bin, before you finally check, in order to see the corrected storage amount on Mac.

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Else: Re: "mac is running very slow":

If installed: Try turning off (or uninstall using the developer's uninstaller) any non-Apple (third-party) apps such as virus-checkers, ad-blockers, cleaners, and the like,. Even VPN can cause issues. See if there is an improvement in your mac's performance.

Also: See if anything in this Apple support article (link below) may be helpful:

If your Mac runs slowly - Apple Support

All the best :-)