You can just use whichever you want, however there are some things you might consider:
- don't go for 5400rpm drives. These shouldnt even be sold anymore but for some reason still are... avoid those, they are awfully slow. Go for 7200rpm
- avoid WD green series drives and similar. Whenever a drive is advertised as being 'green', its very likely to have agressive head parking which will wreck actively used disks in a matter of months.
- don't waste your money on enterprise disks. For ceph ist just not worth it since a drive failure is completely irrelevant to the data integrity of Ceph.
I'm not sure whether these make any difference (never tried them), but at least Seagate has drives which are listed as CCTV drives which are allegedly optimized for 24/7 writing and they are like 5$ more expensive than the regular drive... whereas "Enterprise" disks tend to be WAY more expensive by a completely unreasonable factor of FOUR - needless to say they dont last 4 times as long...