I want to transfer some midi files to my Casio LK-230 keyboard. When I plug in the usb cable it does recognize the casio unit but it does not show up on my computer...like there is not unit... How do I transfer midi files to this keyboard

Like your Yamaha midi needs drivers.
https://www.solvusoft.com/en/update/drivers/music-keyboard/casio/privia/px-120/model-numbers/

You can't use SDCARD for CTK810 model.

Please connect to a computer using a USB cable. Then you can use a commercial MIDI file player to play to your keyboard.
Alternatively, you can download SMF Converter from
http://music.casio.com/e/smf/
This program will convert SMF (.mid files) into a format readable by your Casio keyboard and then load it directly into your keyboard.

PX 410r uses IDES 4.0 downloadable from
http://www.casio-europe.com/euro/emi/specials/ides/downloads/
and not another version.

I suggest you uninstall the Casio USB driver from Control Panel'system'device manager then Reboot the PC without the USB cable.
Download latest USB driver from :-
http://support.casio.com/en/support/download.php?cid=008&pid=20
64 or 32 bits versions are both available.
Load driver first. Plug in the usb cable only when software tells you to do so.
Uninstall Data manager if wrong version.
Install IDES 4.0

Your keyboard only has a USB port.
You need to buy a std USB printer cable (A-B).
Download the drivers from Casio.com
Instal the driver first and connect the cable when asked to.
Once connected, the PC will have software MIDI-IN and MIDI-out for your LK94TV

try
http://support.casio.com/en/support/download.php?cid=008&pid=20

use the audio output to send the keyboards internal patch sounds, or use a usb midi adapter to use the keyboard to trigger the garageband midi sounds, if the keyboard has a midi output, that is. the usb output requires software drivers to use, and IS NOT mac compatible. You may have to select a midi source in garage band preferences or settings if you are using midi.

Hello - I am too a personal owner of a CASIO CTK keyboard, a little older than yours (model CTK-601) a great keyboard BTW, and I have connected it to my computer successfuly.

There are 2 ways of connecting the keyboard to your PC......Using the MIDI outputs and a special MIDI to gameport adapter - if you have a very old system and have a joystick port (D-sub shape) on your soundcard or PC, then you use that cable. Of course this is legacy and stopped existing in newer computers, now USB is used.

Only the professional line of soundcards have direct MIDI inputs. For most of us, with consumer soundcards and PCs, there are no MIDI inputs.

The good news is that newer keyboards support USB MIDI and features direct USB connection - so all you have to do is install the drivers that are provided with your keyboard, usually a CD, and follow the instruction to install the USB drivers for your casio keyboard, BEFORE you plug in the cable (very important!) once installed you reboot and connect your keyboard using a USB cable

Now if your keyboard is older and has MIDI outputs, like mine for example, you will need to purchase a MIDI to USB adapter, those have MIDI cables in one end that plug to your keyboard and the other end a USB connector....... I don't know about the rules if I am allowed to post websites, but the product i'm using is the Uno from M-Audio - in google do this search:

"m-audio"uno

(exactly as shown above with quotes, and uno outside quotes)

Your CTK-810 may alreayd have a USB connector on it, as it is a newer generation keyboard - I am pretty sure it does - what you will have to do as stated above is located your bundled CD-ROM and install the USB drivers - you will need to purchase a USB cable (seperately).

Try downloading MidiOx and troubleshooting with it. It will show you if you have any midi activity and which channel your Casio is transmitting on etc.

Anvil Studio is an easy way to prep midi files for keyboard use, save channels 3 & 4 "left & right" in Midi 0 format and it will light the keys properly. Keep your file size under 80k!

If you have the smart card slot you can save your songs to the memory card by using Anvil Studio which is a free program. Save your midi song in Format 0 and be sure to use channel 4 for right hand playing and channel 3 for left hand. Be sure to keep the file size under 80k if you have other channels active for other instruments!