sas_disk_blink: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/sas_disk_blink - from package: sdparm

You may install the required package with command apt-get install {package}

Error in other languages:
sas_disk_blink: bevel nie gevind nie
sas_disk_blink: comandă negăsită
sas_disk_blink: comando não encontrado
sas_disk_blink: commande introuvable
sas_disk_blink: command not found
sas_disk_blink: käsku ei ole
sas_disk_blink: không tìm thấy lệnh
sas_disk_blink: komanda nerasta
sas_disk_blink: Kommando nicht gefunden.
sas_disk_blink: kommandot finns inte
sas_disk_blink: komut yok
sas_disk_blink: nie znaleziono polecenia
sas_disk_blink: níor aimsíodh an t-ordú
sas_disk_blink: no se encontró la orden
sas_disk_blink: no s'ha trobat l'ordre
sas_disk_blink: opdracht niet gevonden
sas_disk_blink: parancs nem található
sas_disk_blink: perintah tidak ditemukan
sas_disk_blink: príkaz nenájdený
sas_disk_blink: příkaz nenalezen
sas_disk_blink: команда не найдена
sas_disk_blink: командата не е открита
sas_disk_blink: 命令找不到
sas_disk_blink: コマンドが見つかりません