Well, I repartitioned the whole drive and this time didn’t have any issues with any minimum sizes. This is the output from fdisk -l -u afterwards:
Disk /dev/sdb: 1500.3 GB, 1500301910016 bytes
255 heads, 63 sectors/track, 182401 cylinders, total 2930277168 sectors
Units = sectors of 1 * 512 = 512 bytes
Disk identifier: 0x000350f8
Device Boot Start End Blocks Id System
/dev/sdb1 64 30716279 15358108 83 Linux
/dev/sdb2 30716280 61432559 15358140 83 Linux
/dev/sdb3 63472816 2930272064 1433399624+ 83 Linux
/dev/sdb4 61432560 63472814 1020127+ 82 Linux swap / Solaris
Partition table entries are not in disk order
Looks to me like the partitions are properly aligned.
