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Fast copying of files with two different names

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Edit: I've changed the names of the data so that they're all the same Edit: I decided to use a symlink as suggested in the comments, but now SeventhList is too short, it has 1428 elements in it when it should have 1432 elements. Why is this and how can I change it? len(AllFileList) is 10000, which is correct...

I have a list of files MC_File0.root... MC_File9999.root.

They're all inside a directory MCAll and I want to split them into 7 equal chunks and copy them to their respective directories MCFirstSeventh, MCSecondSeventh, ...

Following advice from the first commenter I have a better chunking system than before, but the copying is still slow. Is there a way to speed it up or is it hardware limited?

StartDir = "/data05/padme/beth/MC_Run660/RawMCFiles"
FirstEndDir   = "/data05/padme/beth/MC_Run660_FirstSeventh/RawMCFiles"
SecondEndDir  = "/data05/padme/beth/MC_Run660_SecondSeventh/RawMCFiles"
ThirdEndDir   = "/data05/padme/beth/MC_Run660_ThirdSeventh/RawMCFiles"
FourthEndDir  = "/data05/padme/beth/MC_Run660_FourthSeventh/RawMCFiles"
FifthEndDir   = "/data05/padme/beth/MC_Run660_FifthSeventh/RawMCFiles"
SixthEndDir   = "/data05/padme/beth/MC_Run660_SixthSeventh/RawMCFiles"
SeventhEndDir = "/data05/padme/beth/MC_Run660_SeventhSeventh/RawMCFiles"

AllFileList = os.listdir(StartDir)
#sorted(AllFileList, key=lambda x: int(x.split("_")[-1].split(".")[0]))

n = len(AllFileList)/7

FirstList = [AllFileList[i:i + n] for i in xrange(0, n, 1)]
SecondList = [AllFileList[i:i + n] for i in xrange(n, 2*n, 1)]
ThirdList = [AllFileList[i:i + n] for i in xrange(2*n, 3*n, 1)]
FourthList = [AllFileList[i:i + n] for i in xrange(3*n, 4*n, 1)]
FifthList = [AllFileList[i:i + n] for i in xrange(4*n, 5*n, 1)]
SixthList = [AllFileList[i:i + n] for i in xrange(5*n, 6*n, 1)]
SeventhList = [AllFileList[i:i + n] for i in xrange(6*n, len(AllFileList), 1)]

print 6*n

for ii in FirstList[0]:
    print ii

for ii in SecondList[0]:
    print ii

for ii in ThirdList[0]:
    print ii

for ii in FourthList[0]:
    print ii

for ii in FifthList[0]:
    print ii

for ii in SixthList[0]:
    print ii

for ii in SeventhList[0]:
    print ii

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