Alexander Dalloz wrote: > Am 12.08.2013 17:07, schrieb m.roth at 5-cent.us: >> Mike McCarthy wrote: >>> Update to CentOS6 or try reformatting them to multiple ext3 (under 2TB) >>> partitions. >>> >>> On 08/12/2013 09:59 AM, james wrote: >>>> We have a 3TB external USB drive that I am trying to attach to some >>>> CentOS5 servers. I have tried an older Dell PE1950 and a newer R310 >>>> but neither >>>> one seems to be able to read the drive. It works no problem on windows >>>> servers/workstations and I was able to format with NTFS. >> >> Oh, right, related: it's almost a complete certainty that the drive's >> *real* blocksize is 4k, but has internal code to present it as 512bytes. >> When you format the drive, be 100% sure to align it correctly: for >> parted, tell it 0.0TB, which will put it at 1M. The alignment really >> *does* make a difference in access and throughput speed. > > Don't know where you take this certainty from, but to remind > > https://access.redhat.com/site/documentation/en-US/Red_Hat_Enterprise_Linux/5/html/5.6_Technical_Notes/ch03.html > > "4 kilobyte physical sectors, 4 kilobyte logical sector harddisks > > 4 kilobyte physical sectors, 4 kilobyte logical sector harddisks > require firmware and software modifications to function. This type of 4 > kilobytes sector disks is currently not supported in Red Hat Enterprise > Linux 5" > > Have an external 3TB Seagate drive myself in the office for which this > is the case. > I'll note right back at'cha that all of the 3TB drives we have appear to have firmware in them that will present the blocks as 512b. mark