Linux on poisoning u disk partitioning and formatting

U disk is 4G, two areas, namely 2G.

One of the partitions in Windows "my computer" in the invisible, but in disk management, you can see, there is no letter cannot be formatted in FC6, command fdisk-l can see the 2 partitions/dev/sda1/dev/sda2, but one partition cannot be mounted. I have a good backup of the contents of the partition, ready to repartition and format. Steps are as follows: fdisk/dev/sda//on the u disk rebuild partition table Command (mforhelp): mCommandactionatoggleabootablelagbeditbsddisklabelctogglethedoscompatibilitylagddeleteapartitionllistknownpartitiontypesmprintthismenunaddanewpartitionocreateanewemptyDOSpartitiontablepprintthepartitiontableqquitwithoutsavingchangesscreateanewemptySundisklabeltchangeapartition'ssystemiduchangedisplay/entryunitsvverifythepartitiontablewwritetabletodiskandexitxextrafunctionality (expertsonly) Command (mforhelp): w//save changes and exit the fdisk/dev/sda//prepare partitions la Command (mforhelp): n//create a new partition has 2 options: e and pe is an extended partition, and p is a primary partition, we want to select primary partition, otherwise an error occurs (anyway I selected e is wrong) I am going to split a region, the direct use of the default. Command (mforhelp): w//save changes and exit this partitioned table created OK, now let's start formatting. I want to format as FAT32 format mkfs.vfat-I-OUSB/dev/sda1 format completed. Incidentally, I did not format, it can identify a 4G capacity, but only you can use 2 G.