Quote - Are the textures files on the external usb2 hard drive ?
Is Poser7 installed on the external hard drive ?

As you engage hi capacity render file (i guess you'll get a swap file of more 4GB), i think the problem come from USB2 port.

Do you know, the size of a file transfert is limited in USB2 port ?
You cannot transfer a 4GB file with USB2
why ?

it is a limit by external hard drive cache memory and OS system.

The limit of 4GB per file on an external drive is nothing to do with any limit by the hard drive cache or the OS. It is because of the file system on the drive. FAT32 has a 4GB limit. If the external drive is formatted with NTFS for example then there is effectively no limit.