WolfDie and mrkimrkonja What power supply are you using? i use SATA power cable for the disk from PC's power supply and 3V CR2032 batery for the TTL-RS232 adapter I duobt is it power problems, the disk probubly has more bugs then other disks the disk makes same noises every time I power it up, nomater is it by software (hyperterm) or hardware by normal PC power up it spins up and than makes 10-11 head movment before it stops and spins down the other 3 segates 500GB make normal starup noises: spin up and short head movment listen to the sound in attachmenet Sound_clip_19v.mp3