With modern disc drives sectors are no longer marked bad by a disc scan, if the SMART firmware detects a sector it has trouble accessing it will attempt to invisibly reallocate it to a spare area of the disc.
To help explain what the numbers mean here is an extract from the Wikipedia
S.M.A.R.T. article:
*Reallocated Sectors Count*
Count of reallocated sectors. When the hard drive finds a read/write/verification error, it marks this sector as "reallocated" and transfers data to a special reserved area (spare area). This process is also known as remapping, and "reallocated" sectors are called remaps. This is why, on modern hard disks, "bad blocks" cannot be found while testing the surface – all bad blocks are hidden in reallocated sectors. However, as the number of reallocated sectors increases, the read/write speed tends to decrease. The raw value normally represents a count of the number of bad sectors that have been found and remapped. Thus, the higher the attribute value, the more sectors the drive has had to reallocate.
*Pending sector count*
Number of "unstable" sectors (waiting to be remapped, because of read errors). If an unstable sector is subsequently written or read successfully, this value is decreased and the sector is not remapped. Read errors on a sector will not remap the sector (since it might be readable later); instead, the drive firmware remembers that the sector needs to be remapped, and remaps it the next time it's written.
Large numbers of Reallocs or Pending Sectors would suggest your drive is failing and that you may need to repair or replace your iPod.
The fact that there are none pending is possibly a good sign, but 520 reallocs seems a lot for what otherwise looks like a new drive. I've a nasty suspicion that the high temp. reading of 62c might be the cause of your problems. If you've left the device where it has been allowed to get too hot it may have warped components in the drive. The iPod Classic tech. specs include the following:
*Environmental requirements*
Operating temperature: 32° to 95° F (0° to 35° C)
Nonoperating temperature: -4° to 113° F (-20° to 45° C)
Relative humidity: 5% to 95% noncondensing
Maximum operating altitude: 10,000 feet (3000 m)
Other reasons for iTunes locking up when you connect the device include USB communication clashes. You should try the device in different ports or connected to a different computer to see if it can connect relaibly. If you can, perform a full disc format, restore the device, add some files to it, then check the stats again.
For tips on formatting the drive, see
Erase your iPod - The Super Fix for most iPod Problems.
tt2
