Your finding seems to indicate that 240GB mSATA SSD with adapter draws more peak current than 240GB HDD. That is interesting. Maybe poor adapter design contributes to power waste. Please let us know when you have a better adapter board.
Do you think 1TB mSATA SSD need more peak current than iPod (and adapter) can deliver? And can 5.5 Gen's small RAM handle 1TB of LAME v0 VBR mp3?
I heard one may reduce SSD's power draw (while retaining NAND memory) by removing some controllers/components (e.g., those that are overkill for/not utilized by iPod). Please kindly comment. Thank you!
Based on some further reading (http://www.tomshardware.com/reviews/samsung-840-evo-msata-review,3716-9.html), I think 1TB mSATA SSD may not work well in an iPod. I found that, in the case of Samsung 840 EVO mSATA SSD, the 1TB version needs significantly more power that <= 500GB versions, while the 500 GB version does not need much more than 240GB. So 500GB mSATA SSD may be a safer bet