Anyone have a clue why iozone reports disk read rates of
688MegaBytes/s on a 1GB test file? Am I doing something stupid, like
not converting the numbers correctly?

I've attached the iozone report, It's from a single 400GB Seagate SATA drive.
infomatic# iozone -az -g 1g -b ~/seagate.xls
        Iozone: Performance Test of File I/O
                Version $Revision: 3.263 $
                Compiled for 32 bit mode.
                Build: freebsd

        Contributors:William Norcott, Don Capps, Isom Crawford, Kirby Collins
                     Al Slater, Scott Rhine, Mike Wisner, Ken Goss
                     Steve Landherr, Brad Smith, Mark Kelly, Dr. Alain CYR,
                     Randy Dunlap, Mark Montague, Dan Million,
                     Jean-Marc Zucconi, Jeff Blomberg,
                     Erik Habbinga, Kris Strecker, Walter Wong.

        Run began: Wed Aug  2 13:22:54 2006

        Auto Mode
        Cross over of record size disabled.
        Using maximum file size of 1048576 kilobytes.
        Command line used: iozone -az -g 1g -b /root/seagate.xls
        Output is in Kbytes/sec
        Time Resolution = 0.000002 seconds.
        Processor cache size set to 1024 Kbytes.
        Processor cache line size set to 32 bytes.
        File stride size set to 17 * record size.

iozone test complete.
Excel output is below:

"Writer report"
        "4"  "8"  "16"  "32"  "64"  "128"  "256"  "512"  "1024"  "2048"  "4096" 
 "8192"  "16384"
"64"   117858  208475  293496  467159  279442
"128"   13911  14740  32152  25182  67120  84273
"256"   27914  63615  235955  248516  27902  41006  71708
"512"   36384  64875  45791  275720  23293  50131  337516  82223
"1024"   28623  6571  97246  251659  71809  85375  125828  325509  278322
"2048"   47798  52503  41486  83218  79279  66456  47005  113475  74461  101551
"4096"   28189  12285  27437  51167  47354  53293  60537  50633  43507  44217  
59572
"8192"   30163  42406  66024  43097  26781  34145  33147  56543  32099  70854  
46321  66291
"16384"   28205  48073  39713  44404  48775  55348  67135  64065  61474  47064  
45921  45291  67852
"32768"   32041  58188  66444  69155  64704  69603  61746  64296  65845  57059  
54606  55612  64872
"65536"   35468  51383  58800  60465  61065  60876  60873  57916  57607  59288  
58676  56887  59718
"131072"   36040  53350  56741  56059  56369  57402  56329  55548  53857  54671 
 53841  58136  56973
"262144"   41989  54045  56191  56397  56645  56980  54622  56138  55409  57708 
 56486  55746  55302
"524288"   43288  53420  55245  55694  56406  56120  55809  55519  54507  55516 
 55370  55267  56061
"1048576"   46697  52919  54481  54439  55033  54735  54715  54120  55171  
54381  54624  54375  54315

"Re-writer report"
        "4"  "8"  "16"  "32"  "64"  "128"  "256"  "512"  "1024"  "2048"  "4096" 
 "8192"  "16384"
"64"   653745  829499  943164  926881  633683
"128"   18127  67542  124981  202546  191015  469042
"256"   266396  325611  368399  133756  275911  349683  527997
"512"   23810  581247  111862  158560  14502  291555  581877  528987
"1024"   54540  62530  122578  385696  290659  370491  369535  466509  552932
"2048"   54979  64220  31940  70530  81616  35326  48416  79781  108400  71254
"4096"   50653  38137  55127  38932  82662  49606  86061  60064  47201  26341  
63558
"8192"   30646  27428  66534  81869  46981  42537  62341  60307  52390  36061  
46217  69476
"16384"   43660  54881  35682  48482  32834  41479  73412  61000  59474  62223  
56970  53378  71564
"32768"   53460  70274  70062  66694  63557  68102  70000  57039  69162  61680  
64322  72151  52286
"65536"   53877  45904  56165  59962  59226  59401  57805  57885  57730  60035  
59937  59053  60268
"131072"   51140  56017  56050  56288  56041  55215  56123  55062  56726  56384 
 57301  55848  57552
"262144"   48664  55599  56843  57017  56667  57204  55478  57366  57193  56061 
 57085  56457  56565
"524288"   48505  55655  55984  55376  55646  56182  55536  56360  56130  56665 
 56682  56507  55632
"1048576"   50267  52582  53160  53615  53812  53592  53757  53218  53713  
53887  54246  54344  54261

"Reader report"
        "4"  "8"  "16"  "32"  "64"  "128"  "256"  "512"  "1024"  "2048"  "4096" 
 "8192"  "16384"
"64"   943164  1144170  1365309  1256653  1280633
"128"   636395  1153045  1468419  1488779  1307491  1346852
"256"   885478  1163807  1361560  1407980  1375513  1422906  1319723
"512"   873453  1069138  1330031  1330031  1414110  1422540  1295529  980760
"1024"   920953  1143004  1245780  1426135  1426135  1190859  1326585  889667  
865465
"2048"   881234  1228430  1436297  1471229  1476539  1519371  1353467  837257  
799687  842512
"4096"   927107  1229979  1448358  1494862  1506925  1531235  1355348  820840  
822963  780774  824148
"8192"   879832  1244800  1471785  1506701  1528892  1553009  1348254  799535  
777007  758717  767907  778186
"16384"   895302  1142931  1481929  1518440  1530207  1416206  1242720  765569  
788939  781013  780454  778447  806892
"32768"   919105  1218542  864316  1469689  1488713  1485736  668693  787238  
779372  786841  785425  509760  784094
"65536"   761380  1235825  1459208  1484433  1461458  1530606  1283914  794974  
797157  800008  615938  793068  621046
"131072"   633657  765388  989238  1000846  1005277  1021447  736023  563563  
575147  563714  624497  619541  623292
"262144"   658390  841343  936489  1011584  953216  963832  813197  574896  
575783  553644  588020  590345  591741
"524288"   686819  794963  925677  948728  935700  1011334  801743  591357  
579748  579211  566809  582985  583995
"1048576"   679776  832252  941298  938521  928695  916677  737492  571229  
549857  554969  566850  385615  555466

"Re-Reader report"
        "4"  "8"  "16"  "32"  "64"  "128"  "256"  "512"  "1024"  "2048"  "4096" 
 "8192"  "16384"
"64"   1084099  1601534  1950677  1681806  1454056
"128"   1057641  1232453  1969363  1940885  1488779  1562436
"256"   1088312  1618028  1957199  2015994  1705404  1775920  1496271
"512"   912808  1280084  1533247  1547611  1505303  1561112  1354356  957154
"1024"   945692  1196499  1441936  1512519  1523788  1542393  1358044  885813  
883445
"2048"   927477  1193442  1486247  1521524  1543117  1536492  1341210  844500  
840781  837012
"4096"   931733  1246127  1459184  1514764  1533559  1556202  1361254  744342  
821350  740524  826646
"8192"   907988  1163963  1459966  1390879  1376834  1334016  1104935  809901  
799759  803292  801400  798829
"16384"   929852  1230680  1422716  1511294  1510198  1548586  1330519  798714  
795496  380078  797046  787772  803289
"32768"   926328  1254902  1482787  1513668  1525715  730873  1298313  796670  
795435  796034  512696  805386  793877
"65536"   949630  1248017  1459340  1499855  1506332  1548620  1298102  794597  
679347  803185  808139  806726  806984
"131072"   723319  890392  888088  908266  1017198  866780  831717  617536  
578916  580702  556670  559976  566193
"262144"   689494  839441  907880  1007420  1016042  934449  814025  591753  
595362  580618  555263  554385  561362
"524288"   684363  840981  948154  959585  948690  979267  797484  579514  
577248  572631  584040  576773  580530
"1048576"   672020  822023  913461  933458  970749  969651  794629  574864  
573996  576962  595680  583550  578118

"Random read report"
        "4"  "8"  "16"  "32"  "64"  "128"  "256"  "512"  "1024"  "2048"  "4096" 
 "8192"  "16384"
"64"   939862  1305547  1736194  1528576  1386465
"128"   895364  1279447  1803932  1780008  1388657  1664141
"256"   948023  1415404  1908496  2078432  1620469  1591644  1319723
"512"   855022  1261288  1802167  1019886  1487577  1537638  1463250  958864
"1024"   824431  1162495  1575203  1605228  1605228  1510391  1333173  881993  
864246
"2048"   798721  1141578  1434138  1509227  1540902  1588783  1355389  819915  
817885  824163
"4096"   763054  1094634  1381394  1435170  1510901  1558602  1309480  789965  
754045  814149  806467
"8192"   728306  1068346  1228906  1423198  1463386  1517079  1237626  791432  
806782  743578  805515  748128
"16384"   678257  968035  1316424  1387414  1359903  1472593  1268996  756867  
767330  770902  764785  775539  747823
"32768"   663063  964506  1227356  1325407  1387815  1422828  1220783  765034  
773103  777595  780953  779726  784260
"65536"   640952  945030  1205014  1332143  1379385  1440700  1217800  780673  
785303  787181  786395  791745  787305
"131072"   467218  686970  1052930  1152067  1050871  1269398  895171  652119  
718931  729101  646011  631301  724491
"262144"   318401  531819  776325  876753  940663  949366  836638  612331  
620968  573660  621029  609173  602468
"524288"   269055  441973  694269  776272  869791  884580  740950  562209  
568158  563129  573242  566312  574998
"1048576"   248604  410498  648478  745748  795160  856404  702773  543486  
550697  543243  563310  551004  569213

"Random write report"
        "4"  "8"  "16"  "32"  "64"  "128"  "256"  "512"  "1024"  "2048"  "4096" 
 "8192"  "16384"
"64"   660176  11301  1084099  1189813  1256653
"128"   20237  76015  128143  248021  316064  452440
"256"   509943  379198  1230492  1202921  300128  517064  483970
"512"   23257  553387  1174379  1289306  240167  365989  1118125  482622
"1024"   474497  179708  1081416  189810  321008  451312  495633  726285  546460
"2048"   113112  214049  182875  200551  324006  298504  439099  580494  620767 
 81903
"4096"   335927  141602  842951  296252  441135  502958  306446  543449  139566 
 616415  56287
"8192"   214276  95964  316978  326230  564341  802898  696307  158560  573593  
160190  632140  78164
"16384"   76772  114710  259671  406026  253590  427044  412777  497557  202336 
 628604  120199  668792  70230
"32768"   25826  48242  275592  404302  283782  421991  419457  508559  561624  
241459  435715  112419  676117
"65536"   3712  8608  28418  37414  60571  67982  114477  152406  140826  
154935  125931  74179  85667
"131072"   1643  3673  8364  15026  21872  30313  38728  40281  50509  65172  
68836  67993  64320
"262144"   1114  2169  4603  8415  13822  19978  26690  32989  42054  52142  
54453  59280  56858
"524288"   910  1705  3517  6148  10601  16058  22029  27196  37376  44607  
51683  52913  53263
"1048576"   798  1529  2961  5329  8956  14073  19504  24811  34062  41747  
46940  48185  52688

"Backward read report"
        "4"  "8"  "16"  "32"  "64"  "128"  "256"  "512"  "1024"  "2048"  "4096" 
 "8192"  "16384"
"64"   901966  1030021  1205847  1164016  1046077
"128"   753385  1094289  1330167  1392258  1279447  1363961
"256"   812448  311445  1445900  1241877  1319723  1332828  1230492
"512"   791374  1073413  547044  1023775  1376052  1379588  1252460  951640
"1024"   818617  1109348  1350783  1393288  1444360  1469564  1270470  739286  
872143
"2048"   827816  1152607  1379109  1447430  1474259  1510288  1119704  797238  
820228  822821
"4096"   839696  1156690  1403743  1458069  1506396  1522685  1237064  803751  
817753  805031  816432
"8192"   843854  1145912  1414352  1477926  1503405  1515339  1332257  805987  
751975  776568  729279  761626
"16384"   829568  1170378  1413875  1461040  1503129  1533074  1230592  754813  
770288  756417  766294  754813  771231
"32768"   831423  1142738  1328199  1436374  1458429  1436870  1266991  509460  
774877  779019  494671  767688  575381
"65536"   831802  1132962  1368357  1453637  1476602  1512798  916780  799111  
783838  645942  753555  792512  666225
"131072"   731775  951064  1205634  819625  1277006  1340558  925252  727200  
719661  669465  726019  631775  602361
"262144"   616403  763446  870921  936138  1014018  948302  805279  593230  
558512  556562  604738  594180  569668
"524288"   629279  760065  873868  924733  920140  966199  778618  567960  
572007  570904  575487  573989  567140
"1048576"   609478  765300  863218  892598  912228  945475  729335  555739  
564369  556397  570014  569149  569702

"Record rewrite report"
        "4"  "8"  "16"  "32"  "64"  "128"  "256"  "512"  "1024"  "2048"  "4096" 
 "8192"  "16384"
"64"   477973  726264  718488  570397  345649
"128"   34840  70560  134297  215126  263480  277078
"256"   570347  1048974  1334484  433903  306992  59883  274711
"512"   70127  169766  2007723  1225305  254483  77365  32991  322609
"1024"   769347  74101  2421594  1882427  431888  33774  96149  29172  292401
"2048"   309462  112559  364728  959703  421827  87107  50261  97485  98932  
40118
"4096"   259865  179396  176171  308227  395670  77230  97907  97296  62774  
47332  64081
"8192"   258121  360737  1356504  347146  347385  77333  95896  32178  78258  
42857  50897  62144
"16384"   246732  101531  365607  320965  163576  268523  117348  100064  70129 
 61023  66156  58049  74306
"32768"   131375  140063  338354  85771  347508  294612  84424  89033  90721  
51286  49826  43575  57765
"65536"   126416  488976  193487  82650  85657  169882  92452  89785  77151  
69106  49108  66628  52727
"131072"   191943  144233  178192  88862  95251  170831  91173  89356  69393  
68980  51235  65540  53317
"262144"   163350  242786  251025  93041  98151  180403  99772  94125  83690  
69605  53478  68477  56235
"524288"   151482  297311  344191  91228  99417  174183  98548  95621  84040  
76768  73712  49187  56802
"1048576"   196920  307090  436009  93860  174948  88782  96597  98885  93376  
70959  73826  50380  59386

"Stride read report"
        "4"  "8"  "16"  "32"  "64"  "128"  "256"  "512"  "1024"  "2048"  "4096" 
 "8192"  "16384"
"64"   939862  1494534  1331449  1250797  956609
"128"   766289  1092063  1388657  1774126  1346852  1207505
"256"   744304  1048974  1967960  2082463  1570690  1570690  1201575
"512"   798733  928998  1325925  2358287  2000242  1595916  1372534  946190
"1024"   803757  1111933  1302843  1397368  1741241  1592727  1498796  885813  
872852
"2048"   799315  1128975  1357102  1433181  1197602  1787108  1583803  845581  
827737  823847
"4096"   788153  1079028  1356739  1429200  1486712  1508115  1630492  818532  
819821  815579  735766
"8192"   750186  1056747  1344508  1422432  1471785  1519024  1313866  755647  
812294  805987  760699  751498
"16384"   729896  519352  1236170  1281204  1395585  1400106  1281085  779445  
778932  762900  775977  728372  777003
"32768"   725728  1015811  1243098  1329819  1410764  824599  1236244  771445  
783455  784900  756715  576596  574614
"65536"   728233  1009349  869617  1358571  1412624  1093085  1210800  654429  
794262  788165  789038  798245  798586
"131072"   551494  814110  1006241  974599  1152736  993609  1004036  621436  
702114  658904  671589  706226  688414
"262144"   488433  614594  766588  816345  831546  889347  782008  578050  
591085  592887  598537  592411  740908
"524288"   330601  631103  764731  806114  853014  900728  738405  554011  
572236  580331  573633  569780  588542
"1048576"   323987  535670  756703  813541  841270  875343  722706  548594  
565146  550327  561512  572093  575892

"Fwrite report"
        "4"  "8"  "16"  "32"  "64"  "128"  "256"  "512"  "1024"  "2048"  "4096" 
 "8192"  "16384"
"64"   120341  160392  444715  309395  323178
"128"   29795  61690  102718  163699  189599  274107
"256"   173558  182714  229402  168097  173111  221636  248114
"512"   32064  303848  196016  242664  42133  206040  306931  252241
"1024"   71032  7488  202291  154098  208933  208386  269977  282626  269960
"2048"   28574  57905  46074  84628  111322  21929  35575  10923  39396  40532
"4096"   32313  36343  20428  40400  43504  37371  25185  48052  42285  53984  
22575
"8192"   29297  27645  21547  46385  30177  60747  37799  44092  56211  36807  
49991  31320
"16384"   51985  74634  64751  48399  49246  34965  46793  38706  51431  47810  
60384  42587  64084
"32768"   23588  61511  46536  68839  51658  57271  45208  42511  48835  41917  
50324  42838  38891
"65536"   33284  47077  47355  60183  39840  53654  57066  51313  45609  50968  
54428  47874  44928
"131072"   42362  52639  54173  54817  54704  52446  52672  51318  53377  53239 
 53844  53811  50267
"262144"   44195  53956  55794  55221  53830  54816  54802  52673  54190  55702 
 53748  55104  52647
"524288"   46571  54812  55441  55896  55066  55386  54572  54817  53906  54706 
 54420  54042  54456
"1048576"   47164  53860  54978  54688  55351  54201  54682  54373  53553  
54209  55514  55200  53918

"Re-Fwrite report"
        "4"  "8"  "16"  "32"  "64"  "128"  "256"  "512"  "1024"  "2048"  "4096" 
 "8192"  "16384"
"64"   712765  1120295  1033989  1184562  1227911
"128"   27807  72436  69717  211232  303898  446050
"256"   243334  335480  373136  346523  172057  322870  281998
"512"   45559  583141  337251  335512  265297  291753  556543  172855
"1024"   115809  61801  262022  202091  270760  317519  358672  441750  552363
"2048"   42500  69911  36281  70081  99505  62425  94178  89891  95082  48607
"4096"   51114  35905  30470  33740  63009  50357  37852  72050  36513  38836  
44165
"8192"   44656  41598  45656  47240  62032  65263  49777  59739  47799  63765  
23567  50673
"16384"   60628  66609  66472  75819  66063  34847  57597  38156  59057  39094  
60363  39802  58925
"32768"   44115  69240  42242  65800  42032  63513  50184  41694  41155  41023  
45039  41748  45634
"65536"   44568  49348  49612  57112  61749  58788  61536  47601  50430  48983  
46541  48376  43014
"131072"   50916  55543  57524  55636  57064  58508  55440  50419  50598  51150 
 50815  52241  49048
"262144"   48468  56062  55454  56313  55966  57111  56091  52938  53908  53634 
 53475  53913  52325
"524288"   51261  55661  55685  55267  55800  55497  55703  54610  54373  54256 
 54705  54448  54135
"1048576"   48862  53733  54585  56135  55240  55372  55081  55541  55096  
55009  54908  55036  54462

"Fread report"
        "4"  "8"  "16"  "32"  "64"  "128"  "256"  "512"  "1024"  "2048"  "4096" 
 "8192"  "16384"
"64"   576522  839880  696129  587886  470434
"128"   743988  1015624  1057641  913649  761939  431009
"256"   759573  898069  1058278  901083  802730  581781  449149
"512"   772028  890476  1103757  944525  870620  682691  505455  224853
"1024"   831132  1009010  1126515  1005703  924919  803757  549677  377991  
341667
"2048"   826144  1043403  1198437  1023999  899506  800283  542101  397211  
377801  338618
"4096"   837119  1045728  1158015  883710  971513  927958  584138  408125  
394879  357760  305101
"8192"   826062  1030165  1190540  1052539  976639  953123  583311  392787  
381111  202361  362224  329341
"16384"   809372  1021325  1167951  1004045  965586  930016  571388  402969  
401322  397931  388826  366860  331311
"32768"   794359  1041278  1191778  1021003  953976  946917  573018  409804  
410590  409727  400894  389478  367185
"65536"   827099  815255  1213542  1026596  914985  893056  546958  395775  
397510  352099  398296  354392  345787
"131072"   582314  760892  719610  691613  711110  649356  446313  337110  
338693  338013  330626  337190  329130
"262144"   619134  671207  783824  696191  627023  636897  425565  330437  
338622  333954  336003  326043  319446
"524288"   614594  723424  787378  723347  672277  640674  458238  328487  
339240  333926  331306  332332  330905
"1048576"   604730  597288  772834  699401  681707  669003  445134  332838  
332274  336662  334814  332609  327555

"Re-Fread report"
        "4"  "8"  "16"  "32"  "64"  "128"  "256"  "512"  "1024"  "2048"  "4096" 
 "8192"  "16384"
"64"   939862  1164016  1365309  1033989  887063
"128"   978599  1317114  1576197  1229631  1041231  1023368
"256"   1007629  1339479  1579934  1196221  1027886  918032  503015
"512"   853323  1091971  1236594  1080434  995767  940801  536118  395950
"1024"   689111  1049187  1203203  1060063  982917  951769  579569  424210  
438145
"2048"   838319  1068318  1226325  1056753  860920  946381  570622  425863  
428007  385915
"4096"   836426  1073365  1205722  1055948  974102  965344  519349  410749  
423278  420625  406348
"8192"   797031  958574  1068911  993210  917958  896100  560174  419135  
194436  421811  420402  401865
"16384"   746767  1061622  1176409  423447  940800  957567  578365  414398  
389650  419446  409977  418386  418825
"32768"   532951  1070325  1210802  1058161  980050  957598  588324  319915  
412539  350688  415341  419699  417166
"65536"   842918  1056675  1106862  1040370  918950  901645  476532  340958  
351848  401308  368109  403214  407417
"131072"   585265  699719  719847  755514  661211  705503  451483  337377  
335498  340657  334430  343000  336564
"262144"   608585  713580  781784  706159  658825  627410  411438  343220  
339432  324079  338199  341555  335563
"524288"   587381  704281  779733  715400  694322  668137  461308  329293  
331211  323208  329167  341647  333979
"1048576"   614423  721647  768456  706908  659344  654870  444793  329020  
331836  325319  331992  329256  331524
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