11.8v to 12v step up?

Hey guys! I have an old Commodore 64 power block, and I am trying to use it to power some old recycled hard drives. The power block has +5v, -5v, +12v and -12v, the problem however is the +12v is measured at 11.8v, and the hard drive tries to spin up but then stops. On my lab PSU, the same thing happens at 11.8, but then as soon as I turn it up to 12v, it runs!
I really want to use this Commodore 64 power block for retro looks, I am willing to strip the guts and build my own PSU, however if there is a simple way to step up the voltage (and still have the 1 Amp pf start up current necessary to run the hard drive) I would be interested to know how.
This is all for a POV HDD clock, attached is it working so far. The +12v source for the HDD had to come from my lab PSU in order to test the programming.
Thanks for any suggestions!

On your 12V Power supply(Commodore 64 power block), what are the driving specs(Current) of the power supply? Also what are driving specs(Current) for the Hard Disk? Are you trying to drive a load that the power supply just by the nature of the underlying design and parts will not be able to meet that load.....ie...Need more info to help.....

The problem is in your HD.
It should work on 11.8 Volts.
Or somewhere else, even a new ATX2.2 standard specify 12V -+5%. So it may not work even if you buy a new PSU.
So you can not rely on your HD!
I would not put any data worth saving on that HD.

I suppose you are right, I just watched it die at 12v. Perhaps there was a lack of current capabilities which caused it to burn out. The C64 block was rated at 1amp at 12v, the hard drive however had no amp ratings on it, which I found odd, as almost all my other ones laying around do, but I chose this one for size requirements on spindle height for the stepper motor within.

Ouch......Good luck on the repair of the module.....

Here is a simple way to raise the output by the small amount you are asking for: find where the supply is sampling the output voltage and change it! The simplest way would be to change the resistor divider ratio by soldering an additional resistor on top of the "bottom" resistor in the divider chain. (It is the one that is connected from ground and the feedback input.)

Good luck on your hack.

Exactly it should work on 11.8 volts.

What died ... the PSU or the HD ?

(If not the HD, check its current draw on startup and running with a more powerful 12V supply.)

(If not the PSU, check its current capability and voltage drop with increasing load to determine its useful power rating.)