Yes, they will.  Wish I could elaborate, but there just isn't much to it.  If using non-certified drives, you may see a host of - usually small - issues, ranging from spin-up delays to read/write failures.
Will 6 Seagate Cheetah 10K 300GB 10K Ultra 320 (ST3300007LC) drives work in the 2600 for a total of 1.8TB?  Thanks, Tyler
Poweredge 2600 HDD?