I selected all files and deleted them from my Lexar SD card. With that, I must have deleted a crucial item because now my card isn't recognized in any device. Help :/

Try this: Go to Start, right click on My Computer, select manage. In the left pane click device manager, scroll to Universal Serial Bus Controllers. Delete all of them. System may not allow some to delete, thats fine just delete all that it will allow. Then leave your usb connected to the PC and reboot. OS will reinstall all usb drivers on its own, and it may then see your stick.

Sad to say, you may have to buy another brand SD card, my camera can't recognize Kingston 8 GB card but but recognize Lexar 8 GB card. Good luck.

USB can be recognized by your computer? Try 4Card Recoovery. How to Recover Photos Videos off SD Card after Formatting Unformat SD...

Select system settings, then select data management, Select the "System Memory" tab to delete files from the Nintendo DS system memory. Select the "SD Card" tab to delete files from an SD card. A list of saved files on the system memory or SD card will appear. Select the saved file you want to erase from the list. A prompt will appear.
Choose "Delete" from the prompt and confirm you want to delete the file. The saved file will be immediately erased from the system memory or SD card of the Nintendo DS.

deleting files on sd cards is the same a deleting any other file on a computer as long as the media is not protected against file deletion or file altering

usually sd cards as you used to find also in old floppy dics, have a tab or switch you need to set accordingly to allow file overwriting. inspection the sd card and make sure that the tiny switch or lock is in the off position, reinstall sd card in the reader or sd card drive and attempt to delete files by selecting them and hitting the del key or simple selecting them and right clicking to then select delete.

if the tab is in the off position try it in the "on" position and see if deletion can be accomplished. if neither works your sd card may be defective. contact the provider and have the warranty honored accordingly in within the warranty terms.

To connect the SD memory card to the computer you need a USB memory card reader. Plug the SD memory card into the USB card reader and then plug the card reader into the computer's USB port.
The computer will see this as an external memory card, you can then click on this memory card (it maybe the D or E or F drive) and select the music files from your computer then copy and paste your music files to this memory card. I presume the music files you need to copy are MP3 or MP4 files.

I suggest formatting the card using the utility in the camera. This will delete any data that is currently on the card.

Hi,

Tell me if it recognizes the USB drive ?
If it does, Try plugging card reader and see if that helps !!

Please let me know the status.

Thanks

Do you remember what the name of the card was before you reformated it? Do you have the files that were on there before the reformat?
Windows Media Player is probably just looking at it as if it were another piece of media. There is no distiction between removable and hard disk. Now that that disk has been archived in Windows Media Player and it's directory structure cataloged it is looking for that same setup.
Recreating the volume as it was, might fix the problem but you will loose sorta the functionality of a removable media card.

Yes. Connect it to your computer, then click my computer. You will see your drive listed among the hard drives. Make sure you select the right one (it should say removable drive or Lexar USB) right click it & select format. All files are deleted & the drive is reformatted & ready to use.