SFF-8049 standard for IDE cables says clearly: 18 inches maximum cable
length.
There had been some relaxed standards for CD-ROM devices, but they do not
apply if you connect a hard drive.
It is like overclocking your CPU. It might work - sometimes. For CPU, you
must combat the heat, for long cables - improve signal propagation. Here are
some ideas what to look for: http://bwcecom.belden.com/catalog/TechInfo/TechReducing.htm
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