acidburn87 wrote:
I have no data problem, the first hard disk is damaged and does not read anything, but this is not a problem, from external USB it works but obviously it is slower and ugly to use,
with 20 € I found a caddy to put it in instead of the DVD that I don't use, could it be a valid solution?
I don't quite grok the problem, replace the bad drive; if you want a second drive put one in the DVD caddy.
You say " I tried to replace the hard disk and also tried the flex hdd, every now and then it works and sometimes not "
It is quite possible you do have a bad SATA cable even new out of the box—
Internal SATA cables are actually not cables but flexible circuit boards, usually mylar, with printed circuit traces taking the place of wires. This type of cable can experience cracks in traces due to aging, heat, vibration, impact or abrasion. They can be damaged quite easily if the unit is mishandled during assembly or re-assembly.
In the case of an intermittent generic failure, the electrical continuity of a cracked trace on both sides of the crack is very often a function of the temperature of the unit at the point where the crack exists. As a unit heats up, it expands, and as it expands, the crack widens, eventually forcing a complete electrical separation to exist on both sides of the crack, hence a failure. As it cools down, electrical contact may once again be restored.