Reducing power consumption of second HDD

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http://askubuntu.com – I'm getting a laptop tomorrow with an SSD as the primary (operating system) drive, and I will be putting my old laptop's HDD into it as a secondary drive for holding music etc. Since HDDs use power when idle, just to keep themselves spinning, I was wondering what the optimum settings for 'spinning down' the drive might be, as well as any other tips. I remember seeing reference to a settings file where I would be able to choose how long the drive can sit idle for before spinning down, but I don't know where it was. Additionally, if the drive uses an NTFS file system, will the system write or (HowTos)