udffsck: command not found

Have You tried accessing the binary with the full path?

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 CentOS possible default full paths are:

/usr/bin/udffsck - from package: udftools

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