You find several opinions, inclusive my own, here:
https://forum.amiga.org/index.php?topic=77237

Cant format cylinder 0, normally means dirty heads. Seen it loads of times, reads fine, just will not format.

Fumbled an old external drive with defunc controller into my real A1200 with Gotek, did format the disks in real WB 3.14. The A1200NG did recognize the preformated disks and ADFBlitzer did write disks without problems. Kind of a hassle, works though. Wish I could do all on one Amiga 😂

Can you boot a ATK disk and test the Drive?

The Memorex Disks known good? Tested on another drive etc.. are they HD ones? If so try covering the HD hole in the disk just incase.

Have bought new old stock disks and have had similar issues.

The following software updates for the A600GS and  A1200NG have been uploaded today through the in-built live update system.  They are available to download for all registered AmiSphere users:

46.2.1367:

SystemV46:

AmiPDF NG 46.15:

A fast and feature rich PDF viewer for AmiBench / OS 3.x with the following features:
* Zune / MUI 68K GUI (compatible with OS 3.x)
* Fast PDF decoding and rendering via ArmPDFium library.
* Multiwindow support.
* X Y Scrolling with keyboard arrowkeys or scrollbars.
* Simple intuitive page navigation via toolbar / menu and keyboard arrow keys.
* Zoom gadget.
* Fast and simple search via main GUI, with support for backwards and forwards searching via menus and menu keyboard shortcuts (RAmiga F activate search. RAmiga A find next. RAmiga D find previous)
* Clickable internal link support.
* Clickable external URL support via OpenURL library.

DefIcons:

* def_PDF is now associated to PDF documents and opens AmiPDF application

AmiBrowser:
* Internal fix to improve interaction with AmiPDF.

A600GS/A1200NG: Add ArmPDFIum armlibrary to interface with libpdfium.so providing custom callbacks to invoke pdfium functionality from 68k space.