How to improve your USB transfer speed by increasing the maximum transfer size of 64KB block to 2MB in the Usbstor.sys driver
Those who are using USB 2 devices would complain about the slowness in USB 2.0 transfers being capped at ~ 30MB/s
In fact, this is limited due to Windows default setting of a 64KB transfer block size. By updating your windows registry and modifying it to 2MB transfer, the USB performance can easily exceed 30MB/s reaching 40MB/s and above. The results using CrystalDiskMark can be found here.
You will need to download the hotfix from here.
After you install this update, to increase the maximum transfer size of USB storage devices, follow these steps:
- Click Start
Collapse this imageExpand this image
, type regedit in the Start Search box, and then press Enter.
- Locate and then click the following registry subkey:
HKLM\SYSTEM\CurrentControlSet\Control\usbstor\VVVVPPPP
- Click Edit, point to New, and then click DWORDValue.
- Type MaximumTransferLength, and then press Enter.
- Click Edit, and then click Modify.
- In the Value data box, type a value to specify the maximum transfer size between 64KB and 2MB. For example, you select Decimal and type a value between 65535 (64K) and 2097120 (2M).
- Exit Registry Editor.
Notes
- VVVV represents device descriptor idVendor in hexadecimal.
- PPPP represents device descriptor idProduct in hexadecimal.
Additional file information
Additional file information for Windows 7 and for Windows Server 2008 R2
Additional files for all supported x86-based versions of Windows 7
| File name | X86_usbstor.inf_31bf3856ad364e35_6.1.7600.16849_none_488bef2ff902980f.manifest |
| File version | Not applicable |
| File size | 2,087 |
| Date (UTC) | 15-Jul-2011 |
| Time (UTC) | 05:08 |
| File name | X86_usbstor.inf_31bf3856ad364e35_6.1.7600.21009_none_4940a3cd11fffb57.manifest |
| File version | Not applicable |
| File size | 2,087 |
| Date (UTC) | 15-Jul-2011 |
| Time (UTC) | 08:00 |
| File name | X86_usbstor.inf_31bf3856ad364e35_6.1.7601.17650_none_4a5e79aff6393bdd.manifest |
| File version | Not applicable |
| File size | 2,087 |
| Date (UTC) | 15-Jul-2011 |
| Time (UTC) | 04:58 |
| File name | X86_usbstor.inf_31bf3856ad364e35_6.1.7601.21771_none_4ad376ed0f662ce0.manifest |
| File version | Not applicable |
| File size | 2,087 |
| Date (UTC) | 15-Jul-2011 |
| Time (UTC) | 06:12 |
Additional files for all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
| File name | Amd64_usbstor.inf_31bf3856ad364e35_6.1.7600.16849_none_a4aa8ab3b1600945.manifest |
| File version | Not applicable |
| File size | 2,091 |
| Date (UTC) | 15-Jul-2011 |
| Time (UTC) | 06:04 |
| File name | Amd64_usbstor.inf_31bf3856ad364e35_6.1.7600.21009_none_a55f3f50ca5d6c8d.manifest |
| File version | Not applicable |
| File size | 2,091 |
| Date (UTC) | 15-Jul-2011 |
| Time (UTC) | 08:49 |
| File name | Amd64_usbstor.inf_31bf3856ad364e35_6.1.7601.17650_none_a67d1533ae96ad13.manifest |
| File version | Not applicable |
| File size | 2,091 |
| Date (UTC) | 15-Jul-2011 |
| Time (UTC) | 06:03 |
| File name | Amd64_usbstor.inf_31bf3856ad364e35_6.1.7601.21771_none_a6f21270c7c39e16.manifest |
| File version | Not applicable |
| File size | 2,091 |
| Date (UTC) | 15-Jul-2011 |
| Time (UTC) | 06:59 |
Additional files for all supported IA-64–based versions of Windows Server 2008 R2
| File name | Ia64_usbstor.inf_31bf3856ad364e35_6.1.7600.16849_none_488d9325f900a10b.manifest |
| File version | Not applicable |
| File size | 2,089 |
| Date (UTC) | 15-Jul-2011 |
| Time (UTC) | 06:05 |
| File name | Ia64_usbstor.inf_31bf3856ad364e35_6.1.7600.21009_none_494247c311fe0453.manifest |
| File version | Not applicable |
| File size | 2,089 |
| Date (UTC) | 15-Jul-2011 |
| Time (UTC) | 08:44 |
| File name | Ia64_usbstor.inf_31bf3856ad364e35_6.1.7601.17650_none_4a601da5f63744d9.manifest |
| File version | Not applicable |
| File size | 2,089 |
| Date (UTC) | 15-Jul-2011 |
| Time (UTC) | 05:53 |
| File name | Ia64_usbstor.inf_31bf3856ad364e35_6.1.7601.21771_none_4ad51ae30f6435dc.manifest |
| File version | Not applicable |
| File size | 2,089 |
| Date (UTC) | 15-Jul-2011 |
| Time (UTC) | 07:25 |
The results before and after the patch can be found here.