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The ThinkPad T21 is a laptop with a single drive bay.
You cannot setup this laptop with two hard drives in any RAID configuration.
You can add an external USB hard drive and copy/backup data to this hard drive.
You can connect this laptop to a network and copy/backup data to another computer/server on the network.
This is a common problem with the T20 series Thinkpad. The problem is with the power management chip. Unfortunately, you will have to replace the motherboard to fix it. Since these are a bit on the older side, you can get a motherboard off Ebay at a reasonable price.
i have the same problem. actually its a common problem for many T21 and other old IBM laptops.
i searched that you have to take all power (batery, adaptor)
press the power 10 times and press it for 30 secs then reinsert the battery or adaptor and try to power it on.
they say its done to discharge a certain capacitor that got overcharged after overcharging the battery.
that worked for me before but now my T21 wont start any more with this process.