ATTO Software Downloads Archive

The following are archived versions of ATTO drivers and software.

Click here for current ATTO drivers and software. Drivers and software for discontinued ATTO products are here.

If a driver or software package does not appear on this list, it may still be available by contacting ATTO Tech Support.

The current sort appears below. SEARCH the sorted file listing using the search box (when each sort filter is set to “all”, all files are searched).

ATTO Product:
ExpressSAS

Product Family:
All

Operating System:
macOS

Title
Archived ExpressSAS 12Gb GT Driver macOS
Files in Package:
  • Driver Version (v1.10) 1.9 MB
  • Product Release Notes 193.51 KB
 Archived macOS device driver for ExpressSAS 12Gb GT Host Bus Adapters.

Supports the following macOS Versions: macOS 13 Ventura, macOS 12 Monterey & macOS 11 Big Sur. 		Download
Archived ExpressSAS 12Gb GT Driver macOS
Files in Package:
  • Driver version (v1.09) 2.03 MB
  • Product Release Notes 182.55 KB
 Archived macOS device driver for ExpressSAS 12Gb GT Host Bus Adapters.

Supports the following macOS Versions: macOS 15 Sequoia, macOS 14 Sonoma & macOS 13 Ventura. 		Download
Archived ExpressSAS 12Gb GT Driver macOS – Dext
Files in Package:
  • Driver Version (v1.00.8) 3.13 MB
  • Product Release Notes 116.62 KB
 Archived macOS Dext driver for ExpressSAS 12Gb GT Host Bus Adapters.

Supports the following macOS Versions: macOS 26 Tahoe. 		Download
Archived ExpressSAS 24Gb Driver macOS – Dext
Files in Package:
  • Driver Version (v1.00.8) 3.69 MB
  • Product Release Notes 116.46 KB
 Archived macOS Dext driver for ExpressSAS 24Gb Host Bus Adapters.

Supports the following macOS Versions: macOS 26 Tahoe. 		Download
ExpressSAS 12Gb GT Driver macOS – Dext
Files in Package:
  • Driver Version (v2.01) 3.34 MB
  • Product Release Notes 122.85 KB
 macOS Dext driver for ExpressSAS 12Gb GT Host Bus Adapters.

Supports the following macOS Versions: macOS 26 Tahoe. 		Download
ExpressSAS 12Gb GT Driver macOS – Kext
Files in Package:
  • Driver Version (v1.11.3) 2.07 MB
  • Product Release Notes 201.05 KB
 macOS Kext driver for ExpressSAS 12Gb GT Host Bus Adapters.

Supports the following macOS Versions: macOS 15 Sequoia, macOS 14 Sonoma & macOS 13 Ventura.

In macOS 11, Apple introduced User-Approved Kernel Extension Loading. For additional information on this update, please visit here.

When installing an ATTO driver on macOS, you may get a pop-up message warning stating that “this is a system extension that will be incompatible with a future version of macOS.” There is no need to be concerned. ATTO currently uses Kernel Extension Drivers to provide the highest-performing drivers possible. 		Download
ExpressSAS 24Gb Driver macOS – Dext
Files in Package:
  • Driver Version (v1.02) 3.89 MB
  • Product Release Notes 121.59 KB
 macOS Dext driver for ExpressSAS 24Gb Host Bus Adapters.

Supports the following macOS Versions: macOS 26 Tahoe. 		Download
ExpressSAS 24Gb Driver macOS – Kext
Files in Package:
  • Driver Version (v1.03.3) 2.32 MB
  • Product Release Notes 161.62 KB
 macOS Kext driver for ExpressSAS 24Gb Host Bus Adapters.

Supports the following macOS Versions: macOS 15 Sequoia, macOS 14 Sonoma & macOS 13 Ventura.

In macOS 11, Apple introduced User-Approved Kernel Extension Loading. For additional information on this update, please visit here.

When installing an ATTO driver on macOS, you may get a pop-up message warning stating that “this is a system extension that will be incompatible with a future version of macOS.” There is no need to be concerned. ATTO currently uses Kernel Extension Drivers to provide the highest-performing drivers possible. 		Download
ExpressSAS 24Gb Driver macOS Archive
Files in Package:
  • Driver version: (v1.01) 3.41 MB
  • Product Release Notes 149.7 KB
 Archived macOS device driver for ExpressSAS 24Gb Host Bus Adapters.

Supports the following macOS Versions: macOS 15 Sequoia, macOS 14 Sonoma & macOS 13 Ventura.

In macOS 11, Apple introduced User-Approved Kernel Extension Loading. For additional information on this update, please visit here.

When installing an ATTO driver on macOS, you may get a pop-up message warning stating that “this is a system extension that will be incompatible with a future version of macOS.” There is no need to be concerned. ATTO currently uses Kernel Extension Drivers to provide the highest-performing drivers possible. 		Download
ExpressSAS 24Gb Flash Bundle macOS Archive
Files in Package:
  • Flash Bundle Version: (v09/27/2024) 11.63 MB
  • Product Release Notes 104.92 KB
 Archived macOS flash bundle for ExpressSAS 24Gb adapters.

Instructions on how to flash can be found in the ReadMe downloaded with the flash bundle file.

Supported Products: ExpressSAS H24F0, ExpressSAS H240F & ExpressSAS H240N. 		Download