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. This version of "winxpx86_drv_epciu320_211.exe" has been downloaded 42 times with a user rating of 5 out of 5 stars, based on 5 reviews. It is compatible with PCs running Windows XP, among other operating systems. The total disk space used for this update is 431.2 KB.

5 Ratings

Supported Models

ExpressPCI UL4S


ATTO ExpressPCI UL4D SCSI Adapter

ATTO ExpressPCI UL4S SCSI Adapter

ATTO ExpressPCI UL5D SCSI Adapter

ATTO Phantom Device

ATTO Unpopulated Secondary Channel



Supported Operating Systems

Windows XP, Windows 2000

File Name

Versions (2005-11-11) via .inf
1.20 (2005-01-03) via .inf

Additional Notes

ExpressPCI UL4S (Single Channel Ultra320 SCSI)

ATTO ExpressPCI Host Adapter Driver

Uploaded By

Manivannan (DG Staff Member) on 25-Oct-2006

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, it's time to install it. For Windows users, the built-in Device Manager is your go-to tool for managing system devices and drivers. Here's how to use it:

  1. Right-click the Start button to open the Quick Access menu.

  2. Select "Device Manager" from the list of options.

  3. In the Device Manager window, locate the device that needs updating.

  4. Right-click on the device name and choose "Update driver" from the context menu.

  5. Follow the on-screen instructions to complete the installation process.

Once the installation is complete, restart your computer to ensure the new driver is properly integrated and functional.

This simple process helps keep your system running smoothly and maintains compatibility with your hardware components.

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
Dos/Dos.txt 4.6 KB 19 Nov 2001
Dos/EXPRESS2.SYS 51.4 KB 11 Nov 2005
Dos/SYMCD.SYS 14.0 KB 22 Nov 1996
Dos/utility/BOOTROM2.SYS 40.2 KB 11 Nov 2005
Dos/utility/CONFIG2.COM 52.7 KB 11 Nov 2005
Dos/utility/Epci_mac.u4d 80.4 KB 25 Oct 2005
Dos/utility/FLASH2.EXE 42.2 KB 11 Nov 2005
Dos/utility/FLASH2.TXT 2.7 KB 13 May 2003
Dos/utility/FW_1030.bin 42.8 KB 28 Jan 2005
Dos/utility/FW_1030.nvr 2.0 KB 11 Jan 2005
Dos/utility/Flash.bat 16 bytes 1 Mar 2002
Dos/utility/SCANPCI.EXE 18.9 KB 17 Nov 1999
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 2.5 KB 11 Nov 2005
Latency.reg 542 bytes 2 Apr 2003
Makedisk.bat 535 bytes 24 May 2005
Makedisk.exe 16.4 KB 24 May 2005
Perform.txt 7.7 KB 12 Jan 2005
Readme.txt 1.9 KB 11 Nov 2005
Registry.txt 1.6 KB 12 Jan 2005
Setup.exe 65.5 KB 5 Jan 2005
Stripe.txt 9.1 KB 12 Jan 2005
TXTSETUP.OEM 782 bytes 13 Sep 2005
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 8.3 KB 19 Dec 2005 8.8 KB 19 Dec 2005
express2.sys 109.1 KB 11 Nov 2005
packing.lst 2.4 KB 12 Jan 2005
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