by Suff » 08 Apr 2013, 20:34
Hi Debih,
As WM says, CD is safe as houses, so long as you don't scratch them. There was some question as to whether the dye would degrade over time, but it appears that they are good for about 90 years.
CD-RW can be re-written as can DVD-RW. You might want to consider DVD-R but that's up to you. CD's carry about 700mbytes, DVD-R (I don't like +r, never have), carry about 4,500 mbytes and dual layer dvd-r carry about 8,500 mbytes. It's up to you.
Memory sticks are, again, fine if you write them once and store them. If your machine can support usb and is of Windows XP or higher, then it will always read them.
I prefer hard drives for storage, but you have to consider that the mtbf (mean time between failure), is about 57 years. That, however, is not the realistic figure, I have loads of hard drives which failed in the 5-7 year bracket. So if you are going the hard drive route, then you need more than one and you need to cycle them every 4 or 5 years if you want to be absolutely certain that they are going to last. Of course if you simply pack them in a box they should be fine for a LONG time.
Personally, if it were me and I had decided to go with CD or DVD, I would make two copies. One which is in use and one which is stored in a safe dry place and never touched. After, of course, I had verified that they wrote correctly. You would be surprised at the number of hours I've spent trying to recover partially damaged CD or DVD media. That silver or gold film on top of them is not for decoration, it's the mirror which reflects the laser from the underside. Scratch it and some of the data is lost. Because of the reducing use of CD and DVD media, the tools which can recover data from damaged disks are slowly dying out, meaning if you lose it you lose it.
Digital media is essentially immortal. So long as you protect it and keep perfect copies.....
Just a few thoughts.
There are 10 types of people in the world:
Those who understand Binary and those who do not.