T61: Very slow transfer/copy (write) speeds, disk goes offline, for 1TB HGST (in 2nd HD caddy)

I put in a small 250GB Samsung SSD in my aging T61 (T7300 2GHz, 4GB RAM). Results while mixed are better than my existing 1TB HGST drive. I also decided to move my 1TB drive to the 2nd HD caddy (in place of the DVDRW).
However, I noticed that the transfer (write) speed is extremely poor. Shortly thereafter during transfers, it aborts, and the 2nd HDD goes offline (and is not even visible in Windows Explorer). Checking Device Manager does not reveal any lack of or missing drivers. I did however run Samsung's Magician software (with reliable settings, instead of high performance settings). I wonder if that made any changes to cause this.
I am wondering if it would make more sense to boot off of SSD in the 2nd HD caddy instead of the primary bay, have not tried this option?
Any additional configuration help/ideas/tips will be gratefully appreciated!

Your SSD will be able to read/write at speeds upto SATA1 specs allow (1.5 Gb/s). This can be increased to upto 3.0Gb/s if you install the "middleton" bios which is a lenovo bios that was modified by a 3rd party, however transfers to your ultrabay will be reduced to PATA speeds so even though you have an SATA drive, your max transfer speed will be limited by the interface. This usually isn't a problem because most users keep the data that requires fast access on the primary drive like your OS, installed programs and swap files and use the second drive just for storage.
This should explain the speed issues, but not why your drive is cutting out. If you're using a generic adapter that could be the cause. I've seen some that have poorly fitted connectors and when it comes to generic parts it's difficult to tell the good ones from the bad and the genuine adapters are difficult to find. The only easy way I can think of to confirm this theory would be to substitute a known good part which would be a problem if you don't have one handy.
ThinkPad W-510 i7-820QM(1.73-3.06GHz) Quad Core... ThinkPad T500, T9900, 8gb SSD...FrankNpad T-60p/61p (X9000 2.8ghz) 8gb SSD ips FlexView...ThinkPad T-61p (T9300 2.5ghz) 8gb ram...Thinkpad X-61 Tablet 4gb ram...ThinkPad A-31 (1.9ghz P4 1.5gb ram)

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So I rejigged my setup a tad. My RAID 0 is still FW800, the second drive is back on FW400 on the back port, and the third is USB 2.0 on the back as well.
It's interesting to note that I saw the FW800 taking a bandwidth hit if the FW400 drives was being read/written to. For example, if I was averaging 50-60MB/sec on the FW800 drives and copy something large to the FW400 drive, each drive averages out to about 30/MB second, roughly half the FW800 speed I was getting. The USB while the slowest didn't cause any slowness on the FW drives.
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*MyBook 2TB in a RAID 0 configuration: Firewire 800*
Results 75.42
System Info
Xbench Version 1.3
System Version 10.5.5 (9F33)
Physical RAM 16384 MB
Model MacPro3,1
Drive Type WD My Book
Disk Test 75.42
Sequential 80.92
Uncached Write 69.16 42.46 MB/sec [4K blocks]
Uncached Write 110.79 62.68 MB/sec [256K blocks]
Uncached Read 53.66 15.70 MB/sec [4K blocks]
Uncached Read 136.76 68.73 MB/sec [256K blocks]
Random 70.62
Uncached Write 36.38 3.85 MB/sec [4K blocks]
Uncached Write 140.55 45.00 MB/sec [256K blocks]
Uncached Read 93.26 0.66 MB/sec [4K blocks]
Uncached Read 88.38 16.40 MB/sec [256K blocks]
*MyBook 1TB on Firewire 400*
Results 47.73
System Info
Xbench Version 1.3
System Version 10.5.5 (9F33)
Physical RAM 16384 MB
Model MacPro3,1
Drive Type WD My Book
Disk Test 47.73
Sequential 52.47
Uncached Write 48.45 29.74 MB/sec [4K blocks]
Uncached Write 53.76 30.42 MB/sec [256K blocks]
Uncached Read 43.69 12.79 MB/sec [4K blocks]
Uncached Read 70.91 35.64 MB/sec [256K blocks]
Random 43.78
Uncached Write 17.29 1.83 MB/sec [4K blocks]
Uncached Write 98.83 31.64 MB/sec [256K blocks]
Uncached Read 76.33 0.54 MB/sec [4K blocks]
Uncached Read 97.01 18.00 MB/sec [256K blocks]
*MyBook 500GB on USB 2.0*
Results 40.60
System Info
Xbench Version 1.3
System Version 10.5.5 (9F33)
Physical RAM 16384 MB
Model MacPro3,1
Drive Type WD 5000AA External
Disk Test 40.60
Sequential 35.99
Uncached Write 37.31 22.91 MB/sec [4K blocks]
Uncached Write 37.22 21.06 MB/sec [256K blocks]
Uncached Read 26.62 7.79 MB/sec [4K blocks]
Uncached Read 50.27 25.27 MB/sec [256K blocks]
Random 46.55
Uncached Write 20.37 2.16 MB/sec [4K blocks]
Uncached Write 68.44 21.91 MB/sec [256K blocks]
Uncached Read 93.55 0.66 MB/sec [4K blocks]
Uncached Read 86.71 16.09 MB/sec [256K blocks]
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Thanks

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T61: Very slow transfer/copy (write) speeds, disk goes offline, for 1TB HGST (in 2nd HD caddy)

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