Atto ExpressPCI UL4S Driver Download (Official)

Atto Technology Drivers

The ExpressPCI UL4S is a disk drive controller manufactured by Atto Technology. This driver fixes problems with drive not found, slow or unreliable data transfer, intermittent connection or hardware conflicts. Visitors have downloaded this file "winxpx86_drv_epciu320_300.exe" 19 times with an aggregate rating of 5 out of 5 stars based on 7 reviews. It is compatible with PCs running Windows XP, among other operating systems. The total disk space used for this update is 145.4 KB.

7 Ratings

Supported Models

ExpressPCI UL4S


ATTO ExpressPCI 4DRO SCSI Adapter

ATTO ExpressPCI 4SRO SCSI Adapter

ATTO ExpressPCI 5DRO LP SCSI Adapter

ATTO ExpressPCI 5DRO SCSI Adapter

ATTO ExpressPCI UL4D SCSI Adapter

ATTO ExpressPCI UL4S SCSI Adapter



Supported Operating Systems

Windows XP

File Name


3.001.20 (2005-01-03) via .inf (2006-07-21) via .inf

Additional Notes

Single-Channel Full-Height Ultra320 SCSI PCI-X Host Adapter

Uploaded By

Sathishkumar (DG Staff Member) on 14-Aug-2009

How to Update ExpressPCI UL4S Device Drivers

Step 1 - Download Your Driver

To get the ExpressPCI UL4S driver, click the green download button above. After you complete your download, move on to Step 2.

If the driver listed is not the right version or operating system, search our driver archive for the correct version. Enter Atto ExpressPCI UL4S into the search box above and then submit. In the results, choose the best match for your PC and operating system.

Tech Tip: If you are having trouble deciding which is the right driver, try the Atto Driver Update Utility. It is a software utility which automatically finds and downloads the right driver.

To find the newest driver, you may need to visit the Atto website. Most major device manufacturers update their drivers regularly.

Step 2 - Install Your Driver

After downloading your new driver, installation is the next step. On Windows, utilize the built-in Device Manager utility to manage this process. This tool provides a comprehensive view of all system-recognized devices and their associated drivers. To complete the installation, a system restart is typically required for the driver update to take effect.

Tech Tip: Driver downloads and updates come in a variety of file formats with different file extensions. For example, you may have downloaded an EXE, INF, ZIP, or SYS file. Each file type has a slighty different installation procedure to follow.

For more help, visit our Driver Support Page for step-by-step videos on how to install drivers for every file type.

Driver Contents File List

The following files are found inside the driver download file.

Name Size Date
ATTOMTLN.INF 1.1 KB 3 Jan 2005
Contents.txt 1.5 KB 12 Jun 2006
ELT-1MB.reg 1.5 KB 12 Jan 2005
ELT-256K.reg 1.5 KB 23 Feb 2005
ELT-64K.reg 1.5 KB 12 Jan 2005
ELT-unl.reg 1.5 KB 12 Jan 2005
Express2 41 bytes 12 Jan 2005
Express2.inf 4.7 KB 21 Jul 2006
Latency.reg 542 bytes 2 Apr 2003
Makedisk.bat 291 bytes 5 Mar 2006
Makedisk.exe 16.4 KB 24 May 2005
Perform.txt 5.9 KB 12 Jun 2006
Readme.txt 1.3 KB 12 Jun 2006
Registry.txt 1.6 KB 12 Jan 2005
Setup.exe 69.6 KB 24 May 2006
TXTSETUP.OEM 782 bytes 27 Jun 2006
WinSrv03.txt 7.5 KB 11 May 2005
Win_2000.txt 7.5 KB 11 May 2005
Win_XP.txt 7.5 KB 11 May 2005 9.3 KB 30 Nov 2006 9.7 KB 30 Nov 2006
express2.sys 60.9 KB 21 Jul 2006
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