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ReadyBoost - Flash Memory Speed List
Writer:  HS
5 April 2007

Share Your Flash Device’s ReadyBoost Rating

It only takes 6 easy steps to find out your device’s Random Read Speed and ‘Sequential Write’ Speed. To see if you make the most of ReadyBoost, please refer to our How to Find ReadyBoost Speed Rating article. In this article, we have put together a database to store speed scores that have been submitted by users.

User Contributed Flash Device Speeds

The following Random Read Speeds and Random Write Speeds have been kindly contributed by our users. Hover over a rating’s text to see the credit to the contributor.

Rank Type Brand Model Capacity (MB) File Sys RRead (KB/s) RWrite (KB/s)
1 CF Sandisk Cruzer 8176 FAT32 25600 18432
2 CF Lexar Lexar 4GB 300X Professional UDMA CompactFlash 4000 FAT32 16357 15982
3 CF Transcend 266x 4000 FAT 13300 13240
4 CF Sandisk Extreme III 4000 FAT 6488 8534
5 CF SanDisk Extreme III 1024 FAT 6383 8480
6 CF Kingston Elite Pro CF/1024-S 1000 Unk 3570 5318
7 CF SanDisk Extreme IV 4000 Unk 2962 5485
1 SD EP Memory Extreme Performance (Office Depot) 1000 Unk 8708 6512
2 SD RocketFish x166 2000 FAT 7938 6007
3 SD Transcend TS2GSD150 2000 FAT 7880 6142
4 SD Transcend 150X 4GB 4000 NTFS 7609 5296
5 SD Transcend Transcend 4000 NTFS 7508 5385
6 SD PNY Micro SD Adapter 2048 FAT 7037 4127
7 SD Sandisk Extreme III 2048 FAT 6703 9604
8 SD Transcend TS4GSD150 (150x) 4000 FAT32 6139 4829
9 SD Kingston MicroSD 1 FAT 5776 2630
10 SD Corsair 133x 2000 FAT 5731 3170
11 SD A Data speedy 1024 FAT 5382 3123
12 SD Transcend 150X 4GB 4000 FAT 5176 2903
13 SD Transcend 150X 4GB 4000 FAT32 5158 2538
14 SD Transcend 150X 4GB 4000 NTFS 5153 2329
15 SD Sandisk Standard blue 512 FAT 5144 2063
16 SD Sony MemoryStick Pro Duo 2000 FAT 4862 4558
17 SD Sandisk Extreme III 2048 FAT 4616 7634
18 SD lexar 1gb 1 FAT 4503 4830
19 SD Sandisk Ultra II SD 4000 FAT 4404 2410
20 SD Corsair 40x 1000 FAT 4268 5049
21 SD sandisk ultra II SD 2000 NTFS 4042 3835
22 SD Corsair 133x 2000 FAT 3922 3879
23 SD Sandisk SDSDB-2048-A10 2048 FAT 3906 2145
24 SD Sandisk SDSDB-2048-A10 2048 NTFS 3906 2145
25 SD Scandisk Standard Blue 960 NTFS 3836 3699
26 SD Sandisk Standard Blue 2000 NTFS 3745 1793
27 SD Sandisk Standard Blue 2000 NTFS 3745 1793
28 SD ScanDisk ScanDisk 256 Unk 3744 3015
29 SD SanDisk Extreme III 2000 Unk 3679 5232
30 SD Transcend TS2GUSD MicroSD 2000 Unk 3568 2293
31 SD Sandisk Ultra II Pro Duo 4000 FAT32 3542 2639
32 SD Sandisk Extreme III 2000 FAT32 3528 5059
33 SD Mobimemory Mini SD reader (USB) 512 FAT 3443 5287
34 SD Kingston SD/2GBKR 2000 NTFS 3428 1927
35 SD PNY Optima Pro 133x 2000 FAT 2980 5730
36 SD RiData Pro 120X 2048 FAT 2957 5059
37 SD A-Data Micro SD 2G 2000 FAT 2925 2241
38 SD Kingston SD/2GB 2048 FAT 2871 1869
39 SD SanDisk Ultra II 1024 FAT 2863 4297
40 SD A Data Turbo SD 150X 2000 FAT 2734 2868
41 SD SanDisk Memory Stick PRO Duo Ultra II 512 FAT 2556 3862
42 SD Patriot EP+ 2000 FAT 2370 2393
43 SD SanDisk Ultra II 2GB 2000 FAT 2349 1920
44 SD Silicon Power Secure Digital 2048 FAT 2318 2044
45 SD SanDisk Extreme III 2000 FAT32 2283 5807
46 SD Lexar Platinum II 2000 FAT 2279 3461
47 SD SanDisk Extreme III 2048 NTFS 2277 3669
48 SD Patriot Memory 133x 2000 Unk 2229 3327
49 SD SanDisk Extreme III 2000 FAT 2212 5275
50 SD SimpleTech Standard Digital Media 512 FAT 2212 4148
51 SD SanDisk Extreme III 2000 NTFS 2127 6078
1 SDHC Lexar Platinum II 60x 4000 FAT32 8012 3173
2 SDHC A-data TurboSD SDHC 4G 4000 FAT32 8001 1951
3 SDHC Transcend ts4gusdhc6 4 FAT32 7643 4732
4 SDHC Transcend ts4gusdhc6 4000 NTFS 6578 3554
5 SDHC Lexar Platnum II 4117 FAT32 6471 9168
6 SDHC Sandisk Extreme III 8000 NTFS 4991 3491
7 SDHC Lexar Express Card SSD 4000 FAT32 4619 7500
8 SDHC Sandisk Micro SD 4000 Unk 3406 1980
9 SDHC A Data Turbo SD C6 8000 FAT32 2716 2012
10 SDHC Transcend TS4GSDHC6 4000 Unk 2401 3132
1 THUMB OCZ Rally 2 2000 FAT32 26000 17000
2 THUMB Memorex Mini 1000 FAT32 13500 5000
3 THUMB Corsair TurboFlash 1000 FAT 8117 6982
4 THUMB Corsair Flash Voyager GT 4000 FAT32 8110 12936
5 THUMB DataStick Sport 16000 Unk 8104 3328
6 THUMB Super Talent USB 2.0 4GB 3991 FAT32 8102 6603
7 THUMB Corsair Turboflash 1000 FAT 8093 6992
8 THUMB ATP Petito UFD 1000 Unk 8090 7247
9 THUMB A-Data PD7 4000 FAT32 8084 11671
10 THUMB Apacer HT203 Handy Steno 200x 2000 Unk 8075 9977
11 THUMB Lexar jd 360 4000 FAT32 8072 8339
12 THUMB Apacer HT203 Handy Steno 1000 Unk 8067 9396
13 THUMB Corsair Flash Voyager GT 4000 FAT32 8051 9744
14 THUMB Corsair TurboFlash 1000 FAT32 8012 7250
15 THUMB Kingston Kingston DataTraveler R 2000 FAT32 7987 5995
16 THUMB Apacer Handy Steno HT203 200X 4000 NTFS 7802 9252
17 THUMB Super Talent USB 2.0 8GB RBST 7629 FAT32 7802 3412
18 THUMB Apacer HA202 2000 FAT 7779 9238
19 THUMB Transcend JetFlash 185 2048 FAT 7678 15123
20 THUMB Lexar Jump Drive Lightning II 4096 FAT32 7550 12157
21 THUMB Buffalo Ultra High Speed 2000 FAT 7291 9871
22 THUMB Corsair Flash Voyager 4096 FAT32 7290 2494
23 THUMB Integral Enhanced for Readyboost 2048 FAT32 7265 2286
24 THUMB Buffalo RUF2-S4G-WH 4000 NTFS 7068 9996
25 THUMB Transcend JetFlash TS4GJFV10 3890 FAT32 6835 2698
26 THUMB Lexar Jump Drive Lightning II 4096 FAT32 6741 11320
27 THUMB SanDisk Cruzer Slide SDCZ12-4096-A11A 4000 FAT32 6637 4087
28 THUMB Memorex TravelDrive 8000 FAT32 6573 2078
29 THUMB Corsair VoyagerGT 4000 FAT32 6563 13233
30 THUMB Corsair Voyager GT 4000 FAT32 6557 9919
31 THUMB Corsair Flash Voyager 2000 Unk 6504 11842
32 THUMB Kingston DataTraveler R 2000 FAT 6503 11858
33 THUMB Kingston DataTraveler ReadyFlash (Enhanced for Windows ReadyBoost) 1000 FAT 6501 8305
34 THUMB Peak II Xtreme2 2000 FAT 6492 12152
35 THUMB Verbatim Store and Go 4000 FAT32 6483 1975
36 THUMB Sony S0K USM2GJ(B) 2000 FAT 6476 2772
37 THUMB ADATA PD7 (200x) 4000 NTFS 6471 15208
38 THUMB PNY Attache OPTIMA PRO 2000 FAT 6470 4578
39 THUMB Corsair Voyager GT 2000 FAT32 6467 8627
40 THUMB Kingston DataTraveler ReadyFlash (Enhanced for Windows ReadyBoost) 1000 FAT32 6462 6102
41 THUMB Kingston DataTraveler 2.0 2000 FAT 6459 2974
42 THUMB PNY Attache 2048 FAT 6454 2510
43 THUMB Crucial Gizmo! Overdrive 2000 Unk 6449 6493
44 THUMB Newegg L4GB-RBST 4000 FAT32 6449 2375
45 THUMB Lexar Jump Drive Lightning II 2000 Unk 6444 6832
46 THUMB Lexar jumpDrive firefly 0 FAT32 6438 1912
47 THUMB SuperTalent Flash Drive SM USB20 4000 FAT32 6324 1959
48 THUMB Apacer AH320 Handy Steno 4000 FAT32 6117 2158
49 THUMB S3+ Gumdrive 2000 FAT 5968 2015
50 THUMB Toshiba Travelmate 1000 FAT32 5808 3603
51 THUMB Kingston Data traveller Elite 4000 FAT32 5698 4450
52 THUMB OCZ ET1208AD Rally 2000 Unk 5659 3634
53 THUMB MEMOREX TRAVELDRIVE 4000 FAT32 5534 2138
54 THUMB atlva atlva 0 Unk 5533 5389
55 THUMB Lexar JumpDrive Sport 256 Unk 5507 6065
56 THUMB Kingston U3 DataTraveler 1000 Unk 5506 3900
57 THUMB Lexar Mercury 1000 NTFS 5466 7094
58 THUMB Sandisk CRUZER CONTOUR 4000 NTFS 5442 3535
59 THUMB Lexar Jump drive secure II 512 FAT 5416 8251
60 THUMB Sony Microvault 0 Unk 5411 1990
61 THUMB SanDisk Cruzer 2000 Unk 5407 3701
62 THUMB Lexar Jump Drive Firefly 256 Unk 5395 6582
63 THUMB PQI Cool Drive U310 1000 Unk 5391 3262
64 THUMB Super Talent Model RBST 4000 FAT32 5388 2232
65 THUMB MicroCenter 1G (U3 smart) 1000 FAT 5387 2257
66 THUMB Super Talent RBST-2GB 2024 FAT 5387 2030
67 THUMB Apacer AH320 4000 Unk 5382 2047
68 THUMB Newegg L2GB-RBST 2000 FAT32 5380 2045
69 THUMB Victorinox SwissMemory 1GB 1024 FAT 5373 6945
70 THUMB Lexar Jumpdrive Secure 1024 FAT32 5362 4045
71 THUMB PNY Attache 1000 NTFS 5358 5094
72 THUMB SanDisk Cruzer Crossfire 2000 Unk 5356 2903
73 THUMB SanDisk Cruzer Mini 2000 FAT32 5234 2420
74 THUMB TrekStor USB Stick SE 1000 FAT 5162 1711
75 THUMB Lexar Firefly 4000 NTFS 5118 2301
76 THUMB Sandisk Cruzer micro 1024 FAT32 5116 2066
77 THUMB SanDisk Cruzer Micro w/U3 4000 FAT32 5048 2342
78 THUMB SanDisk Cruzer Contor 4096 NTFS 5019 4167
79 THUMB Sandisk Cruzer Micro 1000 FAT32 5019 2149
80 THUMB Dick Smith Electronics 1 GB Microdrive 1000 FAT32 5017 3848
81 THUMB OCZ Rally2 2000 Unk 4963 2874
82 THUMB PNY Attache 2000 NTFS 4916 1930
83 THUMB SanDisk Cruzer Crossfire 1000 Unk 4889 2287
84 THUMB TOSHIBA TransMemory 2000 Unk 4889 1966
85 THUMB Toshiba transmemory 0 FAT32 4889 1966
86 THUMB Sandisk Cruzer Contour 8000 Unk 4850 5955
87 THUMB A-Data PD10 My Flash 2000 Unk 4827 2032
88 THUMB Imation HMDS-04GD 4000 FAT32 4798 6234
89 THUMB TOSHIBA TransMemory 1000 Unk 4755 2991
90 THUMB Lexar FireFly 4000 FAT32 4726 2264