2,5" vs 3,5" hard disk data recovery differences.

During the las week I spent some hours doing a data recovery for a couple of friends on a laptop and a tower pc.
As you probably know, the hard disks installed on laptops are smaller, in terms of physical inches, than the tower "cousins" but they can contain the same amount of data (for example, 500 gb of memory on a laptop, 500 gb on a tower pc). For this reason, the informations written on the surfaces of the laptop ones are more "tight" each other than on tower's. I knew that, just like I knew that the same physical damage on a laptop hard disk (for example, a certain amount of bad sectors) is way more a disaster than on a 3,5" hdd, but I never checked a proportion of this difference.
I had a (surprising) clear mind of such difference in proportion during the last days: on a 3,5" SATA 120 gb Hitachi hdd, I found almost 7.000 bad sectors, and the pc was still fine. Almost empty - it were just loaded with an Ubuntu distribution, a couple of browsers, LibreOffice and something more - but anyway fast and with no errors. On the other side, 170 bad sectors knocked out the Hitachi 2,5" SATA 120 gb laptop hdd which was loaded, in terms of gigas, exactly like the other one. The system was very slow and lagging, what a difference!
By the way this is a good reason to use for backups, when available, a good old fashion 3,5" external hard drive. Or a cloud data saving solution.
This is Domenico La Tosa, IT services guy in Søborg, Copenhagen, and I hope you liked it. Spørgsmål? Write me an email :-)