This may seem like an odd question, but does anyone know where I can find an image of the magnetic patterns (impressions) that are written to a hard disk? Obviously, this image would be magnified. A description of the pattern would also be a plus.
You should fine in computer architecture materials or in the disk manual
You'll more likely get a description of the sector organization rather than an actual image
In "Computer Architecture & Organization" by Stallings there was the description of the Seagate
If you want the specification of a particular disk, you should check the website of its manufacturer