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We present the results of an experimental study of vortex dynamics innon-twinned $YBa_2Cu_3O_{6,87}$ crystal. It is found that critical currents$J_c$ and $J_{c,dyn}$, which correspond to the pinning force in the thermalcreep and flux flow mode, respectively, non-monotonically vary with themagnetic field. However, the minimum in the $J_{c,dyn}(H)$ dependence isobserved in higher fields, compared with the minimum position $H_{OD}$ in the$J_c(H)$ dependence. Considering that the field $H_{OD}$ corresponds to thestatic order-disorder transition, this difference is explained by partialdynamic ordering of the vortex solid. It is concluded that finite transversebarriers guarantee finite density of transverse displacements of vortex lines$u_t\simeq c_La_0$ suitable for preservation of the disordered state of themoving vortex solid.

Quasi-static and dynamic order-disorder transition in presence of strong pinning