|Assuming it's a new drive, or in any case...|
All optical drives are somewhat sensitive, some are very sensitive (e.g. Pioneer), regarding which media - brands and types of disks - you can use with them successfully.
If you got the drive in a box or just in an anti-static bag, it probably came with a sheet or a paper manual that tells you which media definately works with it properly - if media you try ain't listed, it may or may not work properly with the drive. If you have no such sheet or manual, the Samsung site probably has that known-to-work-in-the-model media info.
Also, sometimes you can find reviews of your particular model on the web in which they have tested several types of media in them.
Some burner drives can't read or can't burn DVD-RAM disks, but apparently this Samsung drive can.
If it isn't a new drive....
- the laser lens may be "dirty" - try using a laser lens cleaning CD in the drive. If you don't have one most places that sell CDs have that, or even some "dollar" stores have them for a buck or two.
Your Samsung drive model can't reach it's full rated max burst data transfer speed unless it's connected to an 80 wire data cable. All 80 wire data cables are rated for ATA or UDMA 66, 100, or 133, and usually have two or three colors of data cable connectors; the one for the mboard end is usually blue, or in any case it's farther from the middle connector on a three connector data cable. If it's connected to a 40 wire data cable it may not work properly otherwise as well, and burning software and Windows may not recognize it correctly.
"I just finished a custom built computer."
Whenever you load Windows from a regular Windows CD (or DVD) from scratch, after Setup is finished you must load the drivers for the mboard, particularly the main chipset drivers, in order for Windows to have the proper drivers for and information about your mboard hardware, including it's AGP or PCI-E, ACPI, USB 2.0 if it has it, and hard drive controller support. If you have a generic system and have the CD that came with the mboard, all the necessary drivers are on it. If you load drivers from the web, brand name system builders and mboard makers often DO NOT have the main chipset drivers listed in the downloads for your model - in that case you must go to the maker of the main chipset's web site, get the drivers, and load them.
- if the mboard supports USB 2.0 , the operating system hasn't installed support for it unless the mboard main chipset drivers have been loaded.
- your hard drives and possibly your optical drives may not be able to achieve their full rated max burst data speed until after the main chipset drivers have been loaded.