An idiots understanding of SSD limitations/trim/GC – guru's please opine

[idata]

In the absence of trim/garbage collection an SSD has the following problem (not present in spinners which can automatically overwrite old data): –In a heavily used drive, the SSD has to find "invalid" pages (as marked by the OS) to write new information. Here we have two sets of problems. Firstly the SSD cannot overwrite the "invalid" page without deleting this page. Secondly, and more seriously, SSD's cannot simply select one or more pages to delete/write but are limited to working with an entire block (each block consisting of 128 pages utilizing 512 K). As a result (barring trim/GC) the SSD has to read the entire block into its cache/flash and perform the delete/write process on the respective pages. It then has to copy the entire "corrected" block from on board cache to the drive even though it might be only working with one or two or more of the total 128 pages within the block. This process is what causes the delays in the heavily used untrimmed SSD. Trim when executed correctly, instantly marks the aforementioned, OS identified invalid pages for deletion. This allows the SSD's controller to execute the time-consuming aforementioned process prior to any writes to these pages (whether this process occurs instantaneously or during idle periods is questionable but irrelevant as long as it occurs relatively quickly). Garbage collection also is designed for the SSD controller to execute a similar erase function based on the design of the SSD controller. Obviously, in very heavily used SSD's and/or inefficient controllers and/or improper OS set up, SSD's will lose their performance and often cause stuttering. In such situations the secure erase followed by an image restore might be the only solution. Wear leveling does not directly affect these processes unless trim/GC cannot keep up with very heavy usage and the drive is saturated. Guru's please opine but be gentle. I am trying my best to understand these processes.

[idata]

It sounds like you describe MFT:

http://www.easyco.com/mft/index.htm http://www.easyco.com/mft/index.htm

http://www.easyco.com/mft/understanding/fastest.htm http://www.easyco.com/mft/understanding/fastest.htm

[idata]

From what I can make out no?

From its PDF about this MFT.

"MFT is presently designed to run on any Windows volume other than boot volumes."

The idea I had in mind is that you can do this on a boot volume.