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I have a desktop computer and a lot of external hard disk cases. I coiled all cables to make them organized and easy to clean. But an electrician told me; if you are using a cable, coiling (wrapping) cables is wrong. It could damage your computer, electronic devices, etc. You should un-wrap cables of devices if you want to use them. So;
Are there any bad effects of coiling electrical cables?
Note: I found this on a Stack Exchange site, but still I'm not sure enough: Physics of Coiled Cables
A quick answer that I learned; If cable is long and power usage will be high (up to 200 W), don't use a coiled cable. It melt and start a fire.