Your disc has ruptured (beyond a herniation, which is full displacement) and the pulpous material (like a jelly doughnut) has become free floating within the disc space. Options are spinal decompression if you have nerve pain or surgery as a last resort to scoop away remaining disc material or allow the nerve root to exit the narrowed cavity without aggravation.
If you mean that 15mm is the diameter, then the circumference will be 47.1mm
It means removed or set apart.
By computer disk storage I assume you mean hard drive storage which is commonly referred to in gigabytes (gb) and sometimes now terabytes (tb - 1000gb)
you got a disc stuck in the disc changer.
Burn a disc means either to download data to a disc or make a copy of another disc.
By sister you mean religious sisters then a nun is cloistered (sequestered) and a sister leads a life of service.
A caliper is a measuring tool that measures either the inside or outside diameter of something. Disc brakes on a car use a caliper to push the brake pads against the rotor to stop the car.
Bulging disc vs herniated disc
it means to draw a net cube with the sides of 15milimeters
What does loss of signal intensity and disc space height mean
Disctear
compact disc