Dissecting The World's Smallest Hard Drive Toshiba MK4001MTD

In this video I dissect the world's smallest hard drive the MK4001MTD manufactured by Toshiba. At .85 inches it's platter is smaller than the more commonly known CF style Microdrive with a 1 inch platter inside. These where only made for internal storage with 2 connection types. One being a MMC+ like connector and the other as a 14 pin ZIF. I have also included a bit of useful information as well for others who may have one and are trying to get it to run however I can't get mine to work at this point. I am not an expert in this topic so maybe some one else can pitch in a few words of advice as well.

YouTuber Janus Cycle made a video on various hard drive form factors including the .85 inch MK4001MTD found in the Nokia N91 check it out.
https://www.youtube.com/watch?v=p7_Zlkj4u4g

Here is the link announcement link on when the .85 inch HDD was made.
https://www.dpreview.com/articles/0246141492/toshibahdd

More information about the lesser known 2GB version the MK2001MTD
https://www.cnet.com/products/toshiba-mk2001mtn-hard-drive-2-gb/

These links are the for the Nokia N91 and Cowon IAudio 6 MP3 player
https://phys.org/news/2005-04-nokia-n91-smartphone-features-gb.html?fbclid=IwAR04Nihl6iVeBlGwWy52W-sQniiS5A-hrB0vcLf1UPA7nX6jyLXmyWvOxKQ

http://www.warrantylife.com/product_files/1/User-Manual/11954381.pdf

Here is the link to the forum post on Tom's Hardware about the interface.
https://forums.tomshardware.com/threads/what-interface-does-the-worlds-smallest-hdd-use.1430500/

This is the data sheet to the SDIO101A card reader IC.
https://www.nxp.com/docs/en/data-sheet/SDIO101A.pdf

Here is the link for the Russian forum on the MK4001MTD in the Nokia N91.
https://vrtp.ru/index.php?showtopic=20791&st=0&

More about the MMC+ pinout and how that works can be found here.
https://www.edn.com/untangle-the-web-of-removable-storage/

Some more reading on the MMC+
http://www.zeroplus.com.tw/software_download/201207-eMMC_en.pdf

Another Forum to look into mentioned by Janus Cycle
https://www.wykop.pl/tag/hdd/

Finally here is the closest thing I could find to a datasheet on the .85 inch drives however it's in Japanese and looks like it doesn't contain any information on the pin out.
https://www.toshiba.co.jp/tech/review/2005/07/60_07pdf/a0203.pdf

If you have any other helpful links please comment them below!

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