Famicom World

Family Computer => Technical & Repair Assistance => Topic started by: alrob1995 on September 11, 2018, 06:26:21 AM



Title: Famicom disk system has err code 27 for kaettekita mario bros
Post by: alrob1995 on September 11, 2018, 06:26:21 AM
Every time I attempt to play Kaettekita Mario bros it gives me a disk error 27, I originally thought it was because of a faulty disk system however my disk system works perfectly with all my five other games. So Iíd assume itís a problem with the game itís self. if thatís the case then how do fix this? The game already looks perfectly clean


Title: Re: Famicom disk system has err code 27 for kaettekita mario bros
Post by: togemet2 on September 11, 2018, 10:07:33 AM
Every time I attempt to play Kaettekita Mario bros it gives me a disk error 27, I originally thought it was because of a faulty disk system however my disk system works perfectly with all my five other games. So Iíd assume itís a problem with the game itís self. if thatís the case then how do fix this? The game already looks perfectly clean

Error 27 means indicates a problem with motor calibration. Thus, the drive cannot read the disk header file. It may, however, just be a problem with the disk. It really depends and it is hard to find the exact cause because of how some error messages aren't even documented. If you've tried other games and they worked perfectly, I would say the disk is at fault but you never know. I'm not really sure if five games are really enough. I've heard in the past it depends on what games you have tested as well.


Title: Re: Famicom disk system has err code 27 for kaettekita mario bros
Post by: nensondubois on September 12, 2018, 02:41:32 AM
It is an IRQ error that is a result of the cutscene banner being drawn and it interferes with the disk reading. It also affects the NES Classic official Canoe emulator as well as disks.


Title: Re: Famicom disk system has err code 27 for kaettekita mario bros
Post by: boye on January 20, 2019, 12:36:13 PM
Try cleaning the disk with a Q-Tip while spinning the center spindle slowly with your fingers.


Title: Re: Famicom disk system has err code 27 for kaettekita mario bros
Post by: stuff_stuff on March 25, 2019, 03:21:44 PM
As I understand, disk writers can be off causing disks written at a disk writer kiosk to be problematic. Various reasons have been given such as disk writer speed or head alignment. This assumes that the disk you received was written at a disk writer kiosk...I cannot remember if this title was ever offered at a disk writer kiosk though.

In my experience, if other disks read and one does not it is likely a head adjustment issue. I'm not advocating for you to adjust the head of your unit, unless you are 100% confident with the process...I've been down a few rabbit holes with head adjustment in the past. It can be a thing of nightmares!! But in my experience this resolves the issue 99% of the time.

Or a disk re-re-write could be in order to get the disk written properly. Both this, and fine tuning head adjustment generally has resolved Error 27's for me in the past. I would not recommend you clean the physical disk itself.

There is a chance it is a bad disk, but over the years I've run into maybe 8 or 9 totally unrecoverable disks.