diff --git a/setup.sh b/setup.sh
index 8211378..37389ec 100644
--- a/setup.sh
+++ b/setup.sh
@@ -87,21 +87,14 @@ function we_have_exactly_one_part () {
     fi
 }
 
-function no_zpool_exists () {
-    declare zpool_list
-    zpool_list="$(zpool list -H)"
-    [[ "$(wc -l <<<"${zpool_list}")" -le '1' ]] && [[ "$(wc -c <<<"${zpool_list}")" -le '1' ]] && return 0
-    return 1
-}
-
-function zpool_drive_id () {
+function get_drive_id () {
     declare drive_id
     drive_id="$(find -L /dev/disk/by-id -samefile "${1:?}")"
-    if [[ "$(wc -l <<<"${drive_id}")" -eq '1' ]]; then
+    if [[ "$(wc -l <<<"${drive_id}")" -eq '1' ]] && [[ "$(wc -c <<<"${drive_id}")" -gt '1' ]]; then
         printf -- '%s' "${drive_id}"
         return 0
     fi
-    printf -- '%s\n' 'More than zpool partition entry in /dev/disk/by-id, exiting 1 ...'
+    printf -- '%s\n' 'Not exactly one '"'${1:?}'"' partition entry in /dev/disk/by-id, exiting 1 ...'
     exit 1
 }