When I try to ersase or record something on my sony walkman mz n910 it says typrotect, and it stops recording, or won't erase the disc

Mini Disks are still available new or used on sites like Ebay and Amazon.
You could also try sites like Freecycle and advertise for them in the wanted section....and get them for free!
http://www.ebay.co.uk/itm/BLANK-SONY-MINI-DISK-MDW-74B-RECORDABLE-MD-/321403225985?pt=UK_Sound_Vision_Other&hash=item4ad5200781

It is possible that the disk was recorded on another recorder using
NetMD in SonicStage. Download SonicStage and edit/ erase your disk from within the program. Does your N910 have a USB port??

Mike

Sony Support web site has stopped support on some MD models,
however if you visit http://forums.sonyinsider.com/index.php?
you can most likely get all the support you need including drivers and SonicStage, which will work on Windows 7 & 8

No. MZ-n510s cannot play those discs. Buy a HI MD machine or sell the disc.
http://www.minidisc.org/hi-md_faq.html#_q96

You can download it from Sony's website.

manual http://www.minidisc.org/part_Sony_MZ-N910.html

download and run the software from
https://www.sony.co.uk/support/en/content/cnt-dwnl/prd-dna/sony-personal-audio-driver/MZ-N910
then plug in the walkman !

i have a n910,yes it has a mic out on it and u can record from an audio source.i used mine at the weekend to record my dj set,just make sure u get a manual with it as i'm having a few problems with record levels being too high,but it's a great bit of kit.

maybe this: removethe battery and use the other one (external lr6 aa)

had the same problem a few minutes ago!
removed the battery but it didn't help.
tried with another md, no success
tried the same md in another Mz 910, no success

then it got on my nerves and I gave the MZ n910 a little shock with my hand.

It worked, stopped spinning and started to play.

It was, I think, a spinning problem, md couldn't play properly, the little shock helped.