I have an inaccessible SD card, and I need to manually rewrite the tables for the filesystem.
Is there a method I can use to directly edit these file system tables in Windows 8? It should preferably also allow me to alter single sectors.
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HxD is the tool you need (if you use Windows).
HxD is a carefully designed and fast hex editor which, additionally to raw disk editing and modifying of main memory (RAM), handles files of any size.
The easy to use interface offers features such as searching and replacing, exporting, checksums/digests, insertion of byte patterns, a file shredder, concatenation or splitting of files, statistics and much more.
Editing works like in a text editor with a focus on a simple and task-oriented operation, as such functions were streamlined to hide differences that are purely technical. For example, drives and memory are presented similar to a file and are shown as a whole, in contrast to a sector/region-limited view that cuts off data which potentially belongs together. Drives and memory can be edited the same way as a regular file including support for undo. In addition memory-sections define a foldable region and inaccessible sections are hidden by default.
Viewing, editing, and repairing system areas
such as the Master Boot Record with its partition table and boot sectors. Tools | Disk Editor | Access button
If you're using Linux, you can try hexedit, it's a command line tool with text user interface.