What are Wedges

[xsoliman]

Still looking at Seagate terminal internal drive stuff

Could anyone explain what Wedges in this context means

eg

HDA SN: 6VMS60J2, RPM: 7201, Wedges: 120, Heads: 2, Lbas: 00003A386030, PreampType: 73 03
PCBA SN: 0000M1302QLS, Controller: YETIST_3_*/4_0(649B)(3-12-3-3), Channel: AGERE_COPPERHEAD_LITE, PowerAsic: MCKINLEY DESKTOP LITE Rev 15, BufferBytes: 1000000

and

User Partition
LBAs 000000000000-00003A38602F
PBAs 000000000000-00003ACE5288
HdSkew 006E, CylSkew 002D
ZonesPerHd 11

Head 0, PhyCyls 000000-0392CA, LogCyls 000000-03857A

Physical Logical Sec Sym Sym Data
Zn Cylinders Cylinders Track Wedge Track Rate
00 000000-00035B 000000-00035B 09A0 10F2 001340A0 1590.000
01 00035C-00500B 00035C-00500B 0A44 121A 00149100 1698.750
...

The System Partition only uses 2 zones on the 2 heads and uses a common Sec Track, Sym Wedge and Sym Track


The Wedge numbers (approx. 30 of them) are in the range 06xx to 12xx
not sure how that's fits with Wedges: 120

Thanks

[guru]

slices of cake looking from the top...Think about it

[guru]

http://hddscan.com/doc/HDD_Tracks_and_Zones.html


A great write up by Doomer

[xsoliman]

Thanks

Still trying to understand why the zones and heads have particular Sym Trk and Sym Wedge
or how the various Translate sector commands also return Wdg related info

Maybe it will make sense one day ...