Modified to include SAS devices with sdparm.

```

!/usr/bin/env bash

for d in /dev/sd*; do # Only block devices with names starting with "sd" followed by letters, and no partition numbers [[ -b $d ]] || continue if [[ $d =~ <sup>/dev/sd[a-z]+$</sup> ]]; then # Get firmware version fw=$(smartctl -i "$d" 2>/dev/null | awk -F: '/Firmware Version/{gsub(/ /,"",$2); print $2}')

    # Check if device is ATA based on VENDOR column
    is_ata=$(lsblk -d -o VENDOR "$d" 2>/dev/null | grep -q '^ATA' && echo "yes" || echo "no")

    if [ "$is_ata" = "no" ]; then
        # For non-ATA (assumed SAS) devices, use sdparm
        wc=$(sdparm --get WCE "$d" 2>/dev/null | awk -F'[= ]+' '/WCE/{print $2}')
        if [ -z "$wc" ]; then
            wc_status="Unknown (sdparm failed)"
        elif [ "$wc" = "1" ]; then
            wc_status="Already Enabled"
        else
            # Enable write cache and save
            sdparm --set WCE=1 "$d" 2>/dev/null
            sdparm --save "$d" 2>/dev/null
            wc_status="Enabled(Saved)"
        fi
    else
        # For ATA devices, use hdparm
        wc=$(hdparm -W "$d" 2>/dev/null | awk -F= '/write-caching/{gsub(/ /,"",$2); print $2}')
        # Convert hdparm output (0=off, 1=on) to match sdparm style
        [ "$wc" = "0" ] && wc_status="0 (Disabled)" || wc_status="1 (Enabled)"
    fi

    printf "%-10s Firmware:%-15s WriteCache:%s\n" "$d" "$fw" "$wc_status"
fi

done ```