I bought an external hard drive for this server. USB 2.0, fast, external, lots of memory. But unfortunately incredibly loud (well, at least for my taste ;-)). Since it is only used sporadically for backup reasons, it is ok when it is only running “sometimes” – putting it into standby mode (i.e. spinning it down) after some time would be a perfect solution. hdparm isn’t working for USB storage devices – they use the Linux SCSI emulation layer. For SCSI, a equivalent exists (sdparm), but I simply couldn’t get that one running… That’s why I had to find another solution. Grab it here.