KSD PA18.6 128MS KingSpec 1.8" IDE PATA SSD Hard Drive Disk HD Harddisk MLC 120GB 128GB for IBM ThinkPad X40 X41 X41T Tablet PC|x41 laptop|x40 ssdmlc - AliExpress
ThinkPad X series - Wikipedia
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Resurrected the X40, new CMOS battery and an SSD : r/thinkpad
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old 1.8 inch hard drive 40Gb HDD htc426040g9at00 FOR thinkpad x40 x41 x41t and some mp4 player REPLACE htc426060g9at00|hdd 40gb|hdd hard drivehdd drive - AliExpress
Succeed to install Samsung 1.8" sata ssd on X40/X41 - Thinkpads Forum