Hi Santo, as promised I took pictures of the caddy of UltraBook and UltraBook II (it is the same). The harddrives are slim PATA notebook drives and I ran (until failure) 10GB...160GB drives in the UltraBooks. CAUTION: Fitting a PATA SSD did not work for me - somehow they are probably to fast for at least Solaris 2.6.
Here a thorough documentation of caddy and the electrical connections (without warranty): http://www.baigar.de/UltraBook/UltraBook-HDDcaddy-EBaigar-20230928.pdf CAUTION: The plug listed there probably is, what you find within the Notebooks, so it should fit the adapter (again no warrranty!). For those interested: Here a X-Ray of the DS1553 I used for quickly finding the battery pins for connecting an external battery: http://www.baigar.de/UltraBook/DS1553WrongOrientation20230923_121643.jpg Hope to report Saturday on the NVRAM results and vacation after that until 10/6/2023..
