You can use either one depending on your cabling, if you have 68pn cables and 80pn drives, you can get adapters off ebay for 5.00, hope this answers your question... have a good 1

Sam

"I want to change the old harddrives (4 x Fujitsu MAP3147NC) in our PE 2850."

You have drive bays, as the "C"  on the end of MAP3147NC notes you original drives are SCA, you need SCA drives.

Read this and note the disclaimer... you do not want to use adapters of any sort on SCSI drives, on any arrangement of SCSI drives.

http://www.seagate.com/support/kb/disc/sca.html

What ever drives you get buy NEW Retail. If it does not have a 5 year warranty it is not retail, stay away from OEM with miniscule warranty periods (30 days-3 years). Do not even consider refurb or recertified drives ( these are drives which are often failed raid drives which are returned, somewhat tested, placed on the market again, which are very likely to fail in your server in a short period after installation).

Once you get the drives, check on the manufacturers site for the warranty period remaining, do not trust dealers.

If your scsi drive is cabled, it's a 68pin drive.  If it's hot swappable, it's a 80pin scsi hard drive.  The hot swappable hard drives have carriers housing to go into a hard drive bay slot. You can use different brands but make sure they're the same hard drive size in the array unless you plan on expanding.

Thanks all for your answers.

In the meanwhile I know the difference between 68 pole and 80 pole SCA connectors ;-)

I will order five drives Seagate ST3300655LC (Ultra320 SCSI - Centronics (SCA-2), 80-pole) at an official german distributor, the warranty is 60 months (thanks for your comments, pcmeiners).

The server will be installed completely new (because we are changing from Linux to Windows), so I can build a new RAID array.

Greetings from Germany,

Bernd.

"I will order five drives Seagate ST3300655LC (Ultra320 SCSI - Centronics (SCA-2), 80-pole) at an official german distributor"

I go with the cheapest Internet price, official or unofficial distributor, as long as the drives show at Seagte's site as a retails warranty. Note, Seagate goes by your receipt date for the drive warranty as long as they are retail.

Have fun