Measure Performance of Windows File IO Attribute Settings

The following test tries to measure the performance impact of various Windows File I/O attribute settings. The test copies a user provided file to a user provided destiation path. The test iterators over five different attributes in various combinations for both the source and destination file handle. The file is copied using a 512*512 (262144) size buffer.

D = Default (normal)
S = Sequencial
R = Random
N = No buffer
A = Asynchronous I/O (overlap)

The graphs were created using Excel and a Pivot table of the raw data. The Read attributes are in the columns, with the Write attributes in the rows.

D = Default (normal)
S = Sequencial
R = Random
N = No buffer
A = Asynchronous I/O (overlap)

Disabling the file system buffer decreases performance.
Asynchronous I/O (non-blocking) has limited benefit when doing a file copy which is purely I/O bound. I am assuming that if any cpu activity is required to manipulate the buffer, the Asynchronous modes would out perform the non-asynchronous modes.
Random Read or Random Write are the best settings with Default or Sequencial.

* Click on column heading to sort. Supports multi-column sorts in order sorts applied.
Rows show the write attributes and Columns are the read attributes.

Windows File Performance (MB/sec) using various Attribute settings

Write\Read	D	S	R	N	NS	NR	AN	ANS	ANR	A	AS	AR
D	31.23	41.29	47.63	18.60	18.88	18.47	14.36	14.44	14.23	11.46	26.16	25.04
S	39.88	42.37	39.06	17.08	18.01	17.29	14.02	14.28	14.18	23.99	18.02	23.54
R	46.26	45.81	39.46	17.37	17.97	17.99	14.05	13.49	14.55	26.27	25.79	25.39
N	31.17	38.31	32.42	15.27	16.17	15.41	12.27	12.64	13.25	22.03	23.70	22.03
NS	32.17	34.91	32.43	15.92	16.56	15.26	12.38	12.82	12.99	22.94	21.41	23.02
NR	32.49	32.44	34.12	16.27	14.58	14.92	12.96	12.64	12.56	22.21	23.07	23.52
AN	35.37	37.26	34.21	15.22	15.13	15.63	12.49	12.66	12.87	21.77	23.44	21.89
ANS	35.37	36.67	35.46	15.00	16.58	15.36	12.22	12.61	12.99	23.39	23.89	22.65
ANR	32.73	30.00	34.64	14.92	14.77	15.01	12.40	12.66	12.06	22.82	21.91	21.79
A	42.12	32.75	31.21	18.62	16.97	17.63	14.50	13.96	14.22	25.05	18.12	25.66
AS	42.58	42.35	37.49	17.59	15.24	16.84	13.48	14.74	13.83	19.91	20.03	18.85
AR	40.68	39.67	33.70	17.91	19.16	19.38	13.74	15.14	13.36	16.35	19.26	20.02