diff --git a/hosts/skydick/DATAPOOL.md b/hosts/skydick/DATAPOOL.md
index d5c069b..dfe1b15 100644
--- a/hosts/skydick/DATAPOOL.md
+++ b/hosts/skydick/DATAPOOL.md
@@ -4,8 +4,8 @@
 
 Network: 10GbE bonded (bond0), jumbo frames MTU 9000, subnet 10.0.0.0/16.
 
-Pool: 9 × Seagate Exos/Mach2 ST14000NM0001 14TB SAS (4Kn), each presenting 2 LUNs.
-8 mirrors (from 8 drives) + 1 hot spare + NVMe SLOG/L2ARC. ~50.9T usable.
+Pool: 10 × Seagate Exos/Mach2 ST14000NM0001 14TB SAS (4Kn), each presenting 2 LUNs.
+8 mirrors (from 8 drives) + 2 hot spares + NVMe SLOG/L2ARC. ~50.9T usable.
 See `datapool.nix` header comments for the full drive inventory and mirror layout.
 
 ## Available shares
diff --git a/hosts/skydick/datapool.nix b/hosts/skydick/datapool.nix
index 9e2cfde..c1bdebf 100644
--- a/hosts/skydick/datapool.nix
+++ b/hosts/skydick/datapool.nix
@@ -20,9 +20,9 @@
 #   drive7: d76aa413  (serial ZKL0Y9WR...31Y)
 #   drive8: d82293b3  (serial ZKL1FGTX...D63)
 #   drive9: d822944f  (serial ZKL1FGTM...63J)
-#   drive10: c9bcfa0f (serial ZKL01BH9...9J1)  [pending — sg_format in progress]
+#   drive10: c9bcfa0f (serial ZKL01BH9...9J1)  [spare]
 #
-# Layout (8 active mirrors + 1 hot spare, ~50.9T usable):
+# Layout (8 active mirrors + 2 hot spares, ~50.9T usable):
 #
 #   mirror-0:  drive1-LUN0  drive2-LUN0
 #   mirror-1:  drive1-LUN1  drive2-LUN1
@@ -32,12 +32,11 @@
 #   mirror-6:  drive6-LUN1  drive7-LUN1
 #   mirror-7:  drive8-LUN0  drive9-LUN0
 #   mirror-8:  drive8-LUN1  drive9-LUN1
-#   spare:     drive5-LUN0  drive5-LUN1
+#   spare:     drive5-LUN0  drive5-LUN1  drive10-LUN0  drive10-LUN1
 #
 # If driveN fails: the two mirrors carrying its LUNs each lose one member
-# but stay online via the paired drive. The spare auto-replaces one
-# degraded member. drive10 can be added as a spare or mirror pair once
-# its sg_format completes.
+# but stay online via the paired drive. A spare auto-replaces one
+# degraded member.
 #
 # === Pool creation ===
 #
@@ -60,6 +59,10 @@
 #     mirror wwn-0x6000c500d82293b30000000000000000 wwn-0x6000c500d822944f0000000000000000 \
 #     mirror wwn-0x6000c500d82293b30001000000000000 wwn-0x6000c500d822944f0001000000000000
 #
+#   Spare addition (2026-03-24, drive10 sg_format completed):
+#   zpool add dick \
+#     spare wwn-0x6000c500c9bcfa0f0000000000000000 wwn-0x6000c500c9bcfa0f0001000000000000
+#
 # === NVMe acceleration (Intel DC P4600 750GB, PHKE0163008K750BGN) ===
 #
 #   Partition: