SEMA ELECTRONICS CO.,LTD
FLOPPY DISK DRIVE SPECIFICATION
PAGE 7
MODEL SFD-321B
2.3 Reliability<Note>
(*1) A soft (recoverable) error is defined as a successful attempt to read a track
of data within 3 retries after a read failure .
A read retry is defined as an attempt to read the entire track that a read
failure occurred on.
(*2) A hard (non-recoverable) erroris defined as a failure to read a track of
data within 3 re tries after a re ad failure.
(*3) A seek (access) error is defined as the inability of the drive to seek to
a targeted track within 1 retry. An access retry is defined as one recalibration
with an attempt to seek to the targeted track.
ITEM SPECIFICATION
M.T.B.F.(Mean time between failures) 20000 p ower on hour s (POH)
(25% duty)
M.T.T.R.(Meantimetorepair) 30 minu tes Max .
Component Life 5years
Disk Life 3×106passes per track or more
Disk Insertion 3×104times or m ore
Error Rate
Soft Read Erro r
(*1) 1per10
9bits read
Hard Rea d Error
(*2) 1per10
12 bits read
Seek Error
(*3) 1per10
6seeks