Acheron wrote:UPDATE (of Feb. 19, 2014):
Just been reminded that I never concluded this story: All working well, running xubuntu with TRIM enabled. No issues whatsoever. HDD light works. Hey, after ten years the laptop still works! I like the irony of a 128 GB mSATA, a 1TB HDD in the Ultrabay, in a laptop that came out with a 30 GB HDD!

Thank you very much for updating this thread, David (much appreciated!) - and I am glad to hear that your T42 is running just fine with the 128 GB Crucial M4 mSATA SSD and the mSATA-to-IDE adapter.
Just to clarify for all readers which
specific mSATA-to-IDE adapter
Acheron successfully ended up using in his T42 (together with the 128 GB Crucial M4 mSATA SSD), I will quote part of a PM, received this morning:
[quote="... a PM with message subject:
"Updated experience with mSATA SSD in a T42?", received from Acheron, where he"]
First adapter did not work
*), original HDD has a particular profile to the connector end which is not matched by the generic enclosure type adapter. Wasn't pin alignment with mine; it was the protruding edge of the circuit board.
Second adapter was from Sintech PC adapter on eBay (not a useful source as the adapter seems to have gone from $17 AUD to $132 AUD!); same as
this adapter**). It was an easy fit; it be nice if someone did a multiple mSATA adapters for RAID - lots of room in there!
The T42 is going well, the HDD light works. Now runs xubuntu with TRIM enabled. Not a single issue, I use the SSD as a system drive, the Ultrabay now has a 1 TB HDD mainly for FLAC files.
Generally I would say that the combination of SSD and xubuntu has optimised the system, fast and stable, better than new.
[- don't know of a Ubuntu alternative to Crystaldisk?
***)][/quote]
*) Johan's note: This is the problem described by
GACrabill in
this post (where a solution to the problem is also devised),
**) Johan's note: This is the same adapter as being discussed in the second part of
this post (= the JM20330-based adapter). This adapter is available from e.g.
this eBay shop (and from many other!), for approx. USD 15,- as of today, incl. shipping, worldwide.
Notice however that the ("old") Crucial M4 has been replaced by the (newer) Crucial M500, and that a Crucial representative seems
not to recommend the M500 for use with this adapter, although the details as of why not are clear; see the thread
M500 mSATA with IDE adapter DeLock 62434 (the DeLock 62434 mSATA-to-IDE adapter is seen
here). This issue is futher discussed in the thread
Crucial M500 mSATA to IDE interface with the DeLock62434 adapter.
***) Johan's note: I had asked David if he was perhaps able to share any benchmarks for his T42 with the 128 GB Crucial M4 mSATA SSD, using e.g.
CrystalDiskMark... but this is a Windows-only SW, so no benchmarks at this time...

Perhaps some reader of this thread know of a "comparable" free benchmark utility for ubuntu; the results of which can more or less directly be compared against those reported by CrystalDiskMark?
So, the above approach is yet another proven-successful alternative for those who want to
greatly speed up their T40/T41/T42's through replacing the old, slow, mechanical harddrive with a blazing fast mSATA SSD!
Johan