A method and apparatus for improving servo stability in read heads while
writing is disclosed. In one embodiment, a magnetic storage device
includes a disk surface and a transducer. The disk surface has servo
information and user data stored thereon. The transducer includes a read
head and a write head. The read head is operable to read servo
information and user data from the disk surface. The write head is
operable to write user data onto the disk surface. The read head is
biased by a first bias current when reading user data and servo
information from the disk surface during a read operation. The read head
is biased by a second bias current when reading servo information from
the disk surface during a write operation. The second bias current, which
is different from the first bias current, is selected to increase servo
stability in the read head when writing. Further, the write current may
also be modified from a standard value in order to increase servo
stability in the read head while writing.