[Samba] redhat 8 and large files

[grog]

Dear sirs,

I am running redhat 8, kernal 2.4.20-28.8smp...I can mount my PC easily 
enough, but I want to access a plugin USB drive..so I try to mount that
but on the USB  the disc files are very large 
 e.g.

48 Gb

(it is a plugin USB...400 GB)

which mounts itself on the PC to the F:

i use  the simple command on the linux side

 smbmount "//mozart/f /icy"  username=mozart\paul

and I get a mount ...hurragh

but a simple 'df' seems ok, but the file size list is wrong, and I can access 
the files, but not to thier full extent...i.e. it reads at the start at the 
file then looses the plot...but does not crash just goes on and on....

i.e.
'df'
//mozart/disk1_(F)    373G  372G  1.5G 100% /icy


and a 'll'
[root at reformat01 grog]# ll /icy
total 15033091789
-rwxr-xr-x    1 root     root     596568336 Sep  1 01:36 201A038.segy
-rwxr-xr-x    1 root     root     18446744073056319632 Aug 31 23:39 
209C013.segy
-rwxr-xr-x    1 root     root     662579248 Sep  1 00:56 217A003.segy
-rwxr-xr-x    1 root     root     18446744073259514512 Sep  1 04:05 
225A001.segy
-rwxr-xr-x    1 root     root     18446744072717520752 Sep  1 05:27 
233A016.segy

please can anybody suggest why I cant mount the files and see/use the files 
easily.

Thanks in advance

Grog