Our TV (KDL46ex701) cannot find the external hard drive (Seagate FreeAgent GoFlex STAA250200) when linked via USB. The hard drive supports connection via TV, but the TV does not respond at all to this.
Question no 1: Does the TV support hard drives (it should work as it responds to a USB memory stick)?
You may find this a format issue. My understanding is that your telly will only recognize FAT32 (memory stick format) while your external hard-drive is formatted for NTFS. I would look at this for further information:
I have the KDL-46EX402 and the same problem. External hard drive makes a beep every 18 seconds. FAT32 also does not helped. The fact is that TV has been able to find data on your hard drive. If the hard drive was NTFS format, I got a moment to watch a movie preview. I think also that it is a power problem.
The TV supports external HDD discs. Only FAT32 file system, not partitioned. Since you are using 2.5” HDD it needs to be supplied with power from the TV USB port so try using a shorter cable. When longer USB cable is used the power supply may not get to the HDD.