WD10EARSとかWD20EARXとかウエスタンデジタルの
ハードディスクをいくつか使っておりまして、型番で
何が違うのか疑問だったので調べてみました。
型番のフォーマットはおおよそ次の通り。
WD xxxx ABCD
xxxxの部分・・・容量
単位は次のAの部分
Aの部分・・・容量の単位とフォームファクタ
A GB/3.5-inch
B GB/2.5-inch
C TB/2.5-inch
D TB/2.5- to 3.5-inch backplane adapter
E TB/3.5-inch
F TB/3.5-inch (new format)
G GB/2.5- to 3.5-inch adapter
H GB/2.5- to 3.5-inch backplane adapter
J TB/2.5-inch
K GB/2.5-inch (12.5 mm z-height)
L GB/2.5-inch (7 mm z-height)
N TB/2.5-inch (15.0 mm z-height)
S TB/2.5-inch (7 mm z-height)
T TB/2.5-inch (12.5 mm z-height)
Bの部分・・・ビジネスユニットおよびブランド
A Desktop/WD Blue; WD Green; WD Black; WD Caviar
B Enterprise/WD RE drive families (3-platter)
D Enterprise/WD Raptor
E Mobile/WD Blue; WD Green; WD Black; WD Scorpio
F Desktop NAS/WD Red
H Enthusiast/WD VelociRaptor
K Enterprise/WD XE; WD S25
L Enterprise/WD VelociRaptor
M Branded/WD Branded
N Branded Advanced Format/WD Branded
P Mobile Advanced Format/WD Blue; WD Green; WD Black;WD Scorpio
R Enterprise Advanced Format/WD RE drive families
U Audio/Video Advanced Format - WD AV
V Audio/Video - WD AV
W Enterprise Advanced Format/WD VelociRaptor
Y Enterprise/WD RE drive families (4-platter)
Z Desktop Advanced Format/WD Blue; WD Black; WD Green;WD Caviar
Cの部分・・・回転数とバッファサイズ
A 5400 RPM with 2 MB cache
B 7200 RPM with 2 MB cache
C 5400 RPM with 16 MB cache
D 5400 RPM with 32 MB cache
E 7200 RPM with 64 MB cache (<2 TB)
F 10,000 RPM with 16 MB cache
G 10,000 RPM with 8 MB cache
H 10,000 RPM with 32 MB cache
J 7200 RPM with 8 MB cache
K 7200 RPM with 16 MB cache
L 7200 RPM with 32 MB cache
P IntelliPower™/EM (maximum buffer size offered by product)
R 5400 RPM with 64 MB cache
S 7200 RPM with 64 MB cache (2 TB)
T 10,000 RPM/EM (maximum buffer size offered by product)
V 5400 RPM with 8 MB cache (Mobile)
Y 7200 RPM/EM (maximum buffer size offered by product)
Dの部分・・・インターフェースとコネクタ
A ATA/66 with 40-pin IDE connector
B ATA/100 with 40-pin IDE connector
C ATA with 33-pin connector (zero insertion force—ZIF)
D SATA 1.5 Gb/s with 22-pin SATA connector
E ATA/133 with 40-pin IDE connector
F SAS-3 with 29-pin connector
G SAS-6 with 29-pin connector
S SATA 3 Gb/s with 22-pin SATA connector
SATA 1.5 Gb/s with 22-pin SATA connector (Mobile)
T SATA 3 Gb/s with 22-pin SATA connector (Mobile)
X SATA 3 Gb/s, 6 Gb/s capable with 22-pin SATA connector
Z SATA 6 Gb/s with 22-pin SATA connector
なお、2005年物より前は違うネーミングの模様。